17 files changed, 135 insertions, 141 deletions
diff --git a/setup.cfg b/setup.cfg
index 7ff383c3..9dc712a7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,7 +8,7 @@ license_file = LICENSE
 omit = paramiko/_winapi.py
 
 [flake8]
-exclude = sites,.git,build,dist,demos,tests
+exclude = sites,.git,build,dist,demos
 # NOTE: W503, E203 are concessions to black 18.0b5 and could be reinstated
 # later if fixed on that end.
 # NOTE: E722 seems to only have started popping up on move to flake8 3.6.0 from
diff --git a/tests/stub_sftp.py b/tests/stub_sftp.py
index 100076d6..1528a0b8 100644
--- a/tests/stub_sftp.py
+++ b/tests/stub_sftp.py
@@ -21,18 +21,17 @@ A stub SFTP server for loopback SFTP testing.
 """
 
 import os
-import sys
 
 from paramiko import (
-    ServerInterface,
-    SFTPServerInterface,
-    SFTPServer,
+    AUTH_SUCCESSFUL,
+    OPEN_SUCCEEDED,
     SFTPAttributes,
     SFTPHandle,
-    SFTP_OK,
+    SFTPServer,
+    SFTPServerInterface,
     SFTP_FAILURE,
-    AUTH_SUCCESSFUL,
-    OPEN_SUCCEEDED,
+    SFTP_OK,
+    ServerInterface,
 )
 from paramiko.common import o666
 
@@ -65,7 +64,8 @@ class StubSFTPHandle(SFTPHandle):
 
 class StubSFTPServer(SFTPServerInterface):
     # assume current folder is a fine root
-    # (the tests always create and eventually delete a subfolder, so there shouldn't be any mess)
+    # (the tests always create and eventually delete a subfolder, so there
+    # shouldn't be any mess)
     ROOT = os.getcwd()
 
     def _realpath(self, path):
@@ -206,7 +206,8 @@ class StubSFTPServer(SFTPServerInterface):
             # compute relative to path
             abspath = os.path.join(os.path.dirname(path), target_path)
             if abspath[: len(self.ROOT)] != self.ROOT:
-                # this symlink isn't going to work anyway -- just break it immediately
+                # this symlink isn't going to work anyway -- just break it
+                # immediately
                 target_path = "<error>"
         try:
             os.symlink(target_path, path)
diff --git a/tests/test_auth.py b/tests/test_auth.py
index fe1a32a1..0f8ffc54 100644
--- a/tests/test_auth.py
+++ b/tests/test_auth.py
@@ -250,7 +250,7 @@ class AuthTest(unittest.TestCase):
         self.start_server()
         self.tc.connect(hostkey=self.public_host_key)
         try:
-            remain = self.tc.auth_password("bad-server", "hello")
+            self.tc.auth_password("bad-server", "hello")
         except:
             etype, evalue, etb = sys.exc_info()
             self.assertTrue(issubclass(etype, AuthenticationException))
@@ -265,7 +265,7 @@ class AuthTest(unittest.TestCase):
         self.start_server()
         self.tc.connect()
         try:
-            remain = self.tc.auth_password("unresponsive-server", "hello")
+            self.tc.auth_password("unresponsive-server", "hello")
         except:
             etype, evalue, etb = sys.exc_info()
             self.assertTrue(issubclass(etype, AuthenticationException))
diff --git a/tests/test_buffered_pipe.py b/tests/test_buffered_pipe.py
index 6b54f24d..61c99cc0 100644
--- a/tests/test_buffered_pipe.py
+++ b/tests/test_buffered_pipe.py
@@ -26,7 +26,6 @@ import unittest
 
 from paramiko.buffered_pipe import BufferedPipe, PipeTimeout
 from paramiko import pipe
-from paramiko.py3compat import b
 
 
 def delay_thread(p):
diff --git a/tests/test_client.py b/tests/test_client.py
index e8705d43..1707d015 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -37,7 +37,6 @@ from pytest_relaxed import raises
 
 import paramiko
 from paramiko.pkey import PublicBlob
-from paramiko.common import PY2
 from paramiko.ssh_exception import SSHException, AuthenticationException
 
 from .util import _support, slow
@@ -48,9 +47,9 @@ requires_gss_auth = unittest.skipUnless(
 )
 
 FINGERPRINTS = {
-    "ssh-dss": b"\x44\x78\xf0\xb9\xa2\x3c\xc5\x18\x20\x09\xff\x75\x5b\xc1\xd2\x6c",
-    "ssh-rsa": b"\x60\x73\x38\x44\xcb\x51\x86\x65\x7f\xde\xda\xa2\x2b\x5a\x57\xd5",
-    "ecdsa-sha2-nistp256": b"\x25\x19\xeb\x55\xe6\xa1\x47\xff\x4f\x38\xd2\x75\x6f\xa5\xd5\x60",
+    "ssh-dss": b"\x44\x78\xf0\xb9\xa2\x3c\xc5\x18\x20\x09\xff\x75\x5b\xc1\xd2\x6c",  # noqa
+    "ssh-rsa": b"\x60\x73\x38\x44\xcb\x51\x86\x65\x7f\xde\xda\xa2\x2b\x5a\x57\xd5",  # noqa
+    "ecdsa-sha2-nistp256": b"\x25\x19\xeb\x55\xe6\xa1\x47\xff\x4f\x38\xd2\x75\x6f\xa5\xd5\x60",  # noqa
     "ssh-ed25519": b'\xb3\xd5"\xaa\xf9u^\xe8\xcd\x0e\xea\x02\xb9)\xa2\x80',
 }
 
@@ -497,7 +496,7 @@ class SSHClientTest(ClientTest):
     @requires_gss_auth
     def test_auth_trickledown_gsskex(self):
         """
-        Failed gssapi-keyex auth doesn't prevent subsequent key auth from succeeding
+        Failed gssapi-keyex doesn't prevent subsequent key from succeeding
         """
         kwargs = dict(gss_kex=True, key_filename=[_support("test_rsa.key")])
         self._test_connection(**kwargs)
@@ -505,7 +504,7 @@ class SSHClientTest(ClientTest):
     @requires_gss_auth
     def test_auth_trickledown_gssauth(self):
         """
-        Failed gssapi-with-mic auth doesn't prevent subsequent key auth from succeeding
+        Failed gssapi-with-mic doesn't prevent subsequent key from succeeding
         """
         kwargs = dict(gss_auth=True, key_filename=[_support("test_rsa.key")])
         self._test_connection(**kwargs)
@@ -532,7 +531,8 @@ class SSHClientTest(ClientTest):
         verify that SSHClient's RejectPolicy works,
         even if gssapi-keyex was enabled but not used.
         """
-        # Test for a bug present in paramiko versions released before 2017-08-01
+        # Test for a bug present in paramiko versions released before
+        # 2017-08-01
         threading.Thread(target=self._run).start()
 
         self.tc = paramiko.SSHClient()
@@ -684,9 +684,9 @@ class PasswordPassphraseTests(ClientTest):
         )
 
     @raises(AuthenticationException)  # TODO: more granular
-    def test_password_kwarg_not_used_for_passphrase_when_passphrase_kwarg_given(
+    def test_password_kwarg_not_used_for_passphrase_when_passphrase_kwarg_given(  # noqa
         self
-    ):  # noqa
+    ):
         # Sanity: if we're given both fields, the password field is NOT used as
         # a passphrase.
         self._test_connection(
diff --git a/tests/test_file.py b/tests/test_file.py
index 32b77762..2a3da74b 100644
--- a/tests/test_file.py
+++ b/tests/test_file.py
@@ -168,7 +168,7 @@ class BufferedFileTest(unittest.TestCase):
         """
         if sys.version_info[0] == 2:
             f = LoopbackFile("r+", 16)
-            f.write(buffer(b"Too small."))
+            f.write(buffer(b"Too small."))  # noqa
             f.close()
 
     def test_readable(self):
@@ -215,7 +215,7 @@ class BufferedFileTest(unittest.TestCase):
         offsets = range(0, len(data), 8)
         with LoopbackFile("rb+") as f:
             for offset in offsets:
-                f.write(buffer(data, offset, 8))
+                f.write(buffer(data, offset, 8))  # noqa
             self.assertEqual(f.read(), data)
 
     @needs_builtin("memoryview")
diff --git a/tests/test_gssapi.py b/tests/test_gssapi.py
index 22361958..46d5bbd1 100644
--- a/tests/test_gssapi.py
+++ b/tests/test_gssapi.py
@@ -30,7 +30,7 @@ from .util import needs_gssapi
 
 @needs_gssapi
 class GSSAPITest(unittest.TestCase):
-    def setup():
+    def setup(self):
         # TODO: these vars should all come from os.environ or whatever the
         # approved pytest method is for runtime-configuring test data.
         self.krb5_mech = "1.2.840.113554.1.2.2"
diff --git a/tests/test_hostkeys.py b/tests/test_hostkeys.py
index 535ac6a4..da47362c 100644
--- a/tests/test_hostkeys.py
+++ b/tests/test_hostkeys.py
@@ -122,10 +122,10 @@ class HostKeysTest(unittest.TestCase):
     def test_delitem(self):
         hostdict = paramiko.HostKeys("hostfile.temp")
         target = "happy.example.com"
-        entry = hostdict[target]  # will KeyError if not present
+        hostdict[target]  # will KeyError if not present
         del hostdict[target]
         try:
-            entry = hostdict[target]
+            hostdict[target]
         except KeyError:
             pass  # Good
         else:
diff --git a/tests/test_kex.py b/tests/test_kex.py
index 62512beb..6e446f82 100644
--- a/tests/test_kex.py
+++ b/tests/test_kex.py
@@ -40,8 +40,8 @@ def dummy_urandom(n):
 
 
 def dummy_generate_key_pair(obj):
-    private_key_value = 94761803665136558137557783047955027733968423115106677159790289642479432803037
-    public_key_numbers = "042bdab212fa8ba1b7c843301682a4db424d307246c7e1e6083c41d9ca7b098bf30b3d63e2ec6278488c135360456cc054b3444ecc45998c08894cbc1370f5f989"
+    private_key_value = 94761803665136558137557783047955027733968423115106677159790289642479432803037  # noqa
+    public_key_numbers = "042bdab212fa8ba1b7c843301682a4db424d307246c7e1e6083c41d9ca7b098bf30b3d63e2ec6278488c135360456cc054b3444ecc45998c08894cbc1370f5f989"  # noqa
     public_key_numbers_obj = ec.EllipticCurvePublicNumbers.from_encoded_point(
         ec.SECP256R1(), unhexlify(public_key_numbers)
     )
@@ -70,7 +70,7 @@ class FakeKey(object):
 
 
 class FakeModulusPack(object):
-    P = 0xFFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF
+    P = 0xFFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF  # noqa
     G = 2
 
     def get_modulus(self, min, ask, max):
@@ -111,7 +111,7 @@ class FakeTransport(object):
 
 class KexTest(unittest.TestCase):
 
-    K = 14730343317708716439807310032871972459448364195094179797249681733965528989482751523943515690110179031004049109375612685505881911274101441415545039654102474376472240501616988799699744135291070488314748284283496055223852115360852283821334858541043710301057312858051901453919067023103730011648890038847384890504
+    K = 14730343317708716439807310032871972459448364195094179797249681733965528989482751523943515690110179031004049109375612685505881911274101441415545039654102474376472240501616988799699744135291070488314748284283496055223852115360852283821334858541043710301057312858051901453919067023103730011648890038847384890504  # noqa
 
     def setUp(self):
         self._original_urandom = os.urandom
@@ -128,7 +128,7 @@ class KexTest(unittest.TestCase):
         transport.server_mode = False
         kex = KexGroup1(transport)
         kex.start_kex()
-        x = b"1E000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"
+        x = b"1E000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_group1._MSG_KEXDH_REPLY,), transport._expect
@@ -161,7 +161,7 @@ class KexTest(unittest.TestCase):
         msg.rewind()
         kex.parse_next(paramiko.kex_group1._MSG_KEXDH_INIT, msg)
         H = b"B16BF34DD10945EDE84E9C1EF24A14BFDC843389"
-        x = b"1F0000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"
+        x = b"1F0000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"  # noqa
         self.assertEqual(self.K, transport._K)
         self.assertEqual(H, hexlify(transport._H).upper())
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
@@ -183,7 +183,7 @@ class KexTest(unittest.TestCase):
         msg.add_mpint(FakeModulusPack.G)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_GROUP, msg)
-        x = b"20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"
+        x = b"20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_gex._MSG_KEXDH_GEX_REPLY,), transport._expect
@@ -217,7 +217,7 @@ class KexTest(unittest.TestCase):
         msg.add_mpint(FakeModulusPack.G)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_GROUP, msg)
-        x = b"20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"
+        x = b"20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_gex._MSG_KEXDH_GEX_REPLY,), transport._expect
@@ -254,7 +254,7 @@ class KexTest(unittest.TestCase):
         msg.add_int(4096)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST, msg)
-        x = b"1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102"
+        x = b"1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_gex._MSG_KEXDH_GEX_INIT,), transport._expect
@@ -264,9 +264,9 @@ class KexTest(unittest.TestCase):
         msg.add_mpint(12345)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_INIT, msg)
-        K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581
+        K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581  # noqa
         H = b"CE754197C21BF3452863B4F44D0B3951F12516EF"
-        x = b"210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"
+        x = b"210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"  # noqa
         self.assertEqual(K, transport._K)
         self.assertEqual(H, hexlify(transport._H).upper())
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
@@ -289,7 +289,7 @@ class KexTest(unittest.TestCase):
         msg.add_int(2048)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST_OLD, msg)
-        x = b"1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102"
+        x = b"1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_gex._MSG_KEXDH_GEX_INIT,), transport._expect
@@ -299,9 +299,9 @@ class KexTest(unittest.TestCase):
         msg.add_mpint(12345)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_INIT, msg)
-        K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581
+        K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581  # noqa
         H = b"B41A06B2E59043CEFC1AE16EC31F1E2D12EC455B"
-        x = b"210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"
+        x = b"210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"  # noqa
         self.assertEqual(K, transport._K)
         self.assertEqual(H, hexlify(transport._H).upper())
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
@@ -323,7 +323,7 @@ class KexTest(unittest.TestCase):
         msg.add_mpint(FakeModulusPack.G)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_GROUP, msg)
-        x = b"20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"
+        x = b"20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_gex._MSG_KEXDH_GEX_REPLY,), transport._expect
@@ -357,7 +357,7 @@ class KexTest(unittest.TestCase):
         msg.add_mpint(FakeModulusPack.G)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_GROUP, msg)
-        x = b"20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"
+        x = b"20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_gex._MSG_KEXDH_GEX_REPLY,), transport._expect
@@ -394,7 +394,7 @@ class KexTest(unittest.TestCase):
         msg.add_int(4096)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST, msg)
-        x = b"1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102"
+        x = b"1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_gex._MSG_KEXDH_GEX_INIT,), transport._expect
@@ -404,9 +404,9 @@ class KexTest(unittest.TestCase):
         msg.add_mpint(12345)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_INIT, msg)
-        K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581
+        K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581  # noqa
         H = b"CCAC0497CF0ABA1DBF55E1A3995D17F4CC31824B0E8D95CDF8A06F169D050D80"
-        x = b"210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"
+        x = b"210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"  # noqa
         self.assertEqual(K, transport._K)
         self.assertEqual(H, hexlify(transport._H).upper())
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
@@ -429,7 +429,7 @@ class KexTest(unittest.TestCase):
         msg.add_int(2048)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST_OLD, msg)
-        x = b"1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102"
+        x = b"1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102"  # noqa
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertEqual(
             (paramiko.kex_gex._MSG_KEXDH_GEX_INIT,), transport._expect
@@ -439,16 +439,16 @@ class KexTest(unittest.TestCase):
         msg.add_mpint(12345)
         msg.rewind()
         kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_INIT, msg)
-        K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581
+        K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581  # noqa
         H = b"3DDD2AD840AD095E397BA4D0573972DC60F6461FD38A187CACA6615A5BC8ADBB"
-        x = b"210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"
+        x = b"210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967"  # noqa
         self.assertEqual(K, transport._K)
         self.assertEqual(H, hexlify(transport._H).upper())
         self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
         self.assertTrue(transport._activated)
 
     def test_11_kex_nistp256_client(self):
-        K = 91610929826364598472338906427792435253694642563583721654249504912114314269754
+        K = 91610929826364598472338906427792435253694642563583721654249504912114314269754  # noqa
         transport = FakeTransport()
         transport.server_mode = False
         kex = KexNistp256(transport)
@@ -461,7 +461,7 @@ class KexTest(unittest.TestCase):
         msg = Message()
         msg.add_string("fake-host-key")
         Q_S = unhexlify(
-            "043ae159594ba062efa121480e9ef136203fa9ec6b6e1f8723a321c16e62b945f573f3b822258cbcd094b9fa1c125cbfe5f043280893e66863cc0cb4dccbe70210"
+            "043ae159594ba062efa121480e9ef136203fa9ec6b6e1f8723a321c16e62b945f573f3b822258cbcd094b9fa1c125cbfe5f043280893e66863cc0cb4dccbe70210"  # noqa
         )
         msg.add_string(Q_S)
         msg.add_string("fake-sig")
@@ -474,7 +474,7 @@ class KexTest(unittest.TestCase):
         self.assertTrue(transport._activated)
 
     def test_12_kex_nistp256_server(self):
-        K = 91610929826364598472338906427792435253694642563583721654249504912114314269754
+        K = 91610929826364598472338906427792435253694642563583721654249504912114314269754  # noqa
         transport = FakeTransport()
         transport.server_mode = True
         kex = KexNistp256(transport)
@@ -486,7 +486,7 @@ class KexTest(unittest.TestCase):
         # fake init
         msg = Message()
         Q_C = unhexlify(
-            "043ae159594ba062efa121480e9ef136203fa9ec6b6e1f8723a321c16e62b945f573f3b822258cbcd094b9fa1c125cbfe5f043280893e66863cc0cb4dccbe70210"
+            "043ae159594ba062efa121480e9ef136203fa9ec6b6e1f8723a321c16e62b945f573f3b822258cbcd094b9fa1c125cbfe5f043280893e66863cc0cb4dccbe70210"  # noqa
         )
         H = b"2EF4957AFD530DD3F05DBEABF68D724FACC060974DA9704F2AEE4C3DE861E7CA"
         msg.add_string(Q_C)
diff --git a/tests/test_message.py b/tests/test_message.py
index b7c4960e..57766d90 100644
--- a/tests/test_message.py
+++ b/tests/test_message.py
@@ -29,12 +29,12 @@ from paramiko.common import byte_chr, zero_byte
 class MessageTest(unittest.TestCase):
 
     __a = (
-        b"\x00\x00\x00\x17\x07\x60\xe0\x90\x00\x00\x00\x01\x71\x00\x00\x00\x05\x68\x65\x6c\x6c\x6f\x00\x00\x03\xe8"
+        b"\x00\x00\x00\x17\x07\x60\xe0\x90\x00\x00\x00\x01\x71\x00\x00\x00\x05\x68\x65\x6c\x6c\x6f\x00\x00\x03\xe8"  # noqa
         + b"x" * 1000
     )
-    __b = b"\x01\x00\xf3\x00\x3f\x00\x00\x00\x10\x68\x75\x65\x79\x2c\x64\x65\x77\x65\x79\x2c\x6c\x6f\x75\x69\x65"
-    __c = b"\x00\x00\x00\x00\x00\x00\x00\x05\x00\x00\xf5\xe4\xd3\xc2\xb1\x09\x00\x00\x00\x01\x11\x00\x00\x00\x07\x00\xf5\xe4\xd3\xc2\xb1\x09\x00\x00\x00\x06\x9a\x1b\x2c\x3d\x4e\xf7"
-    __d = b"\x00\x00\x00\x05\xff\x00\x00\x00\x05\x11\x22\x33\x44\x55\xff\x00\x00\x00\x0a\x00\xf0\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x03\x63\x61\x74\x00\x00\x00\x03\x61\x2c\x62"
+    __b = b"\x01\x00\xf3\x00\x3f\x00\x00\x00\x10\x68\x75\x65\x79\x2c\x64\x65\x77\x65\x79\x2c\x6c\x6f\x75\x69\x65"  # noqa
+    __c = b"\x00\x00\x00\x00\x00\x00\x00\x05\x00\x00\xf5\xe4\xd3\xc2\xb1\x09\x00\x00\x00\x01\x11\x00\x00\x00\x07\x00\xf5\xe4\xd3\xc2\xb1\x09\x00\x00\x00\x06\x9a\x1b\x2c\x3d\x4e\xf7"  # noqa
+    __d = b"\x00\x00\x00\x05\xff\x00\x00\x00\x05\x11\x22\x33\x44\x55\xff\x00\x00\x00\x0a\x00\xf0\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x03\x63\x61\x74\x00\x00\x00\x03\x61\x2c\x62"  # noqa
 
     def test_encode(self):
         msg = Message()
diff --git a/tests/test_packetizer.py b/tests/test_packetizer.py
index 62d18376..de80770e 100644
--- a/tests/test_packetizer.py
+++ b/tests/test_packetizer.py
@@ -64,7 +64,7 @@ class PacketizerTest(unittest.TestCase):
         # 32 + 12 bytes of MAC = 44
         self.assertEqual(44, len(data))
         self.assertEqual(
-            b"\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0",
+            b"\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0",  # noqa
             data[:16],
         )
 
@@ -82,7 +82,7 @@ class PacketizerTest(unittest.TestCase):
         ).decryptor()
         p.set_inbound_cipher(decryptor, 16, sha1, 12, x1f * 20)
         wsock.send(
-            b"\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0\x90\xd2\x16\x56\x0d\x71\x73\x61\x38\x7c\x4c\x3d\xfb\x97\x7d\xe2\x6e\x03\xb1\xa0\xc2\x1c\xd6\x41\x41\x4c\xb4\x59"
+            b"\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0\x90\xd2\x16\x56\x0d\x71\x73\x61\x38\x7c\x4c\x3d\xfb\x97\x7d\xe2\x6e\x03\xb1\xa0\xc2\x1c\xd6\x41\x41\x4c\xb4\x59"  # noqa
         )
         cmd, m = p.read_message()
         self.assertEqual(100, cmd)
diff --git a/tests/test_pkey.py b/tests/test_pkey.py
index 1530f47f..f7dabf26 100644
--- a/tests/test_pkey.py
+++ b/tests/test_pkey.py
@@ -25,7 +25,6 @@ import unittest
 import os
 from binascii import hexlify
 from hashlib import md5
-import base64
 
 from paramiko import RSAKey, DSSKey, ECDSAKey, Ed25519Key, Message, util
 from paramiko.py3compat import StringIO, byte_chr, b, bytes, PY2
@@ -34,18 +33,18 @@ from .util import _support
 
 
 # from openssh's ssh-keygen
-PUB_RSA = "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEA049W6geFpmsljTwfvI1UmKWWJPNFI74+vNKTk4dmzkQY2yAMs6FhlvhlI8ysU4oj71ZsRYMecHbBbxdN79+JRFVYTKaLqjwGENeTd+yv4q+V2PvZv3fLnzApI3l7EJCqhWwJUHJ1jAkZzqDx0tyOL4uoZpww3nmE0kb3y21tH4c="
-PUB_DSS = "ssh-dss AAAAB3NzaC1kc3MAAACBAOeBpgNnfRzr/twmAQRu2XwWAp3CFtrVnug6s6fgwj/oLjYbVtjAy6pl/h0EKCWx2rf1IetyNsTxWrniA9I6HeDj65X1FyDkg6g8tvCnaNB8Xp/UUhuzHuGsMIipRxBxw9LF608EqZcj1E3ytktoW5B5OcjrkEoz3xG7C+rpIjYvAAAAFQDwz4UnmsGiSNu5iqjn3uTzwUpshwAAAIEAkxfFeY8P2wZpDjX0MimZl5wkoFQDL25cPzGBuB4OnB8NoUk/yjAHIIpEShw8V+LzouMK5CTJQo5+Ngw3qIch/WgRmMHy4kBq1SsXMjQCte1So6HBMvBPIW5SiMTmjCfZZiw4AYHK+B/JaOwaG9yRg2Ejg4Ok10+XFDxlqZo8Y+wAAACARmR7CCPjodxASvRbIyzaVpZoJ/Z6x7dAumV+ysrV1BVYd0lYukmnjO1kKBWApqpH1ve9XDQYN8zgxM4b16L21kpoWQnZtXrY3GZ4/it9kUgyB7+NwacIBlXa8cMDL7Q/69o0d54U0X/NeX5QxuYR6OMJlrkQB7oiW/P/1mwjQgE="
-PUB_ECDSA_256 = "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBJSPZm3ZWkvk/Zx8WP+fZRZ5/NBBHnGQwR6uIC6XHGPDIHuWUzIjAwA0bzqkOUffEsbLe+uQgKl5kbc/L8KA/eo="
-PUB_ECDSA_384 = "ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBBbGibQLW9AAZiGN2hEQxWYYoFaWKwN3PKSaDJSMqmIn1Z9sgRUuw8Y/w502OGvXL/wFk0i2z50l3pWZjD7gfMH7gX5TUiCzwrQkS+Hn1U2S9aF5WJp0NcIzYxXw2r4M2A=="
-PUB_ECDSA_521 = "ecdsa-sha2-nistp521 AAAAE2VjZHNhLXNoYTItbmlzdHA1MjEAAAAIbmlzdHA1MjEAAACFBACaOaFLZGuxa5AW16qj6VLypFbLrEWrt9AZUloCMefxO8bNLjK/O5g0rAVasar1TnyHE9qj4NwzANZASWjQNbc4MAG8vzqezFwLIn/kNyNTsXNfqEko9OgHZknlj2Z79dwTJcRAL4QLcT5aND0EHZLB2fAUDXiWIb2j4rg1mwPlBMiBXA=="
+PUB_RSA = "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEA049W6geFpmsljTwfvI1UmKWWJPNFI74+vNKTk4dmzkQY2yAMs6FhlvhlI8ysU4oj71ZsRYMecHbBbxdN79+JRFVYTKaLqjwGENeTd+yv4q+V2PvZv3fLnzApI3l7EJCqhWwJUHJ1jAkZzqDx0tyOL4uoZpww3nmE0kb3y21tH4c="  # noqa
+PUB_DSS = "ssh-dss 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"  # noqa
+PUB_ECDSA_256 = "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBJSPZm3ZWkvk/Zx8WP+fZRZ5/NBBHnGQwR6uIC6XHGPDIHuWUzIjAwA0bzqkOUffEsbLe+uQgKl5kbc/L8KA/eo="  # noqa
+PUB_ECDSA_384 = "ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBBbGibQLW9AAZiGN2hEQxWYYoFaWKwN3PKSaDJSMqmIn1Z9sgRUuw8Y/w502OGvXL/wFk0i2z50l3pWZjD7gfMH7gX5TUiCzwrQkS+Hn1U2S9aF5WJp0NcIzYxXw2r4M2A=="  # noqa
+PUB_ECDSA_521 = "ecdsa-sha2-nistp521 AAAAE2VjZHNhLXNoYTItbmlzdHA1MjEAAAAIbmlzdHA1MjEAAACFBACaOaFLZGuxa5AW16qj6VLypFbLrEWrt9AZUloCMefxO8bNLjK/O5g0rAVasar1TnyHE9qj4NwzANZASWjQNbc4MAG8vzqezFwLIn/kNyNTsXNfqEko9OgHZknlj2Z79dwTJcRAL4QLcT5aND0EHZLB2fAUDXiWIb2j4rg1mwPlBMiBXA=="  # noqa
 
 FINGER_RSA = "1024 60:73:38:44:cb:51:86:65:7f:de:da:a2:2b:5a:57:d5"
 FINGER_DSS = "1024 44:78:f0:b9:a2:3c:c5:18:20:09:ff:75:5b:c1:d2:6c"
 FINGER_ECDSA_256 = "256 25:19:eb:55:e6:a1:47:ff:4f:38:d2:75:6f:a5:d5:60"
 FINGER_ECDSA_384 = "384 c1:8d:a0:59:09:47:41:8e:a8:a6:07:01:29:23:b4:65"
 FINGER_ECDSA_521 = "521 44:58:22:52:12:33:16:0e:ce:0e:be:2c:7c:7e:cc:1e"
-SIGNED_RSA = "20:d7:8a:31:21:cb:f7:92:12:f2:a4:89:37:f5:78:af:e6:16:b6:25:b9:97:3d:a2:cd:5f:ca:20:21:73:4c:ad:34:73:8f:20:77:28:e2:94:15:08:d8:91:40:7a:85:83:bf:18:37:95:dc:54:1a:9b:88:29:6c:73:ca:38:b4:04:f1:56:b9:f2:42:9d:52:1b:29:29:b4:4f:fd:c9:2d:af:47:d2:40:76:30:f3:63:45:0c:d9:1d:43:86:0f:1c:70:e2:93:12:34:f3:ac:c5:0a:2f:14:50:66:59:f1:88:ee:c1:4a:e9:d1:9c:4e:46:f0:0e:47:6f:38:74:f1:44:a8"
+SIGNED_RSA = "20:d7:8a:31:21:cb:f7:92:12:f2:a4:89:37:f5:78:af:e6:16:b6:25:b9:97:3d:a2:cd:5f:ca:20:21:73:4c:ad:34:73:8f:20:77:28:e2:94:15:08:d8:91:40:7a:85:83:bf:18:37:95:dc:54:1a:9b:88:29:6c:73:ca:38:b4:04:f1:56:b9:f2:42:9d:52:1b:29:29:b4:4f:fd:c9:2d:af:47:d2:40:76:30:f3:63:45:0c:d9:1d:43:86:0f:1c:70:e2:93:12:34:f3:ac:c5:0a:2f:14:50:66:59:f1:88:ee:c1:4a:e9:d1:9c:4e:46:f0:0e:47:6f:38:74:f1:44:a8"  # noqa
 
 RSA_PRIVATE_OUT = """\
 -----BEGIN RSA PRIVATE KEY-----
@@ -109,8 +108,8 @@ L4QLcT5aND0EHZLB2fAUDXiWIb2j4rg1mwPlBMiBXA==
 
 x1234 = b"\x01\x02\x03\x04"
 
-TEST_KEY_BYTESTR_2 = "\x00\x00\x00\x07ssh-rsa\x00\x00\x00\x01#\x00\x00\x00\x81\x00\xd3\x8fV\xea\x07\x85\xa6k%\x8d<\x1f\xbc\x8dT\x98\xa5\x96$\xf3E#\xbe>\xbc\xd2\x93\x93\x87f\xceD\x18\xdb \x0c\xb3\xa1a\x96\xf8e#\xcc\xacS\x8a#\xefVlE\x83\x1epv\xc1o\x17M\xef\xdf\x89DUXL\xa6\x8b\xaa<\x06\x10\xd7\x93w\xec\xaf\xe2\xaf\x95\xd8\xfb\xd9\xbfw\xcb\x9f0)#y{\x10\x90\xaa\x85l\tPru\x8c\t\x19\xce\xa0\xf1\xd2\xdc\x8e/\x8b\xa8f\x9c0\xdey\x84\xd2F\xf7\xcbmm\x1f\x87"
-TEST_KEY_BYTESTR_3 = "\x00\x00\x00\x07ssh-rsa\x00\x00\x00\x01#\x00\x00\x00\x00ӏV\x07k%<\x1fT$E#>ғfD\x18 \x0cae#̬S#VlE\x1epvo\x17M߉DUXL<\x06\x10דw\u2bd5ٿw˟0)#y{\x10l\tPru\t\x19Π\u070e/f0yFmm\x1f"
+TEST_KEY_BYTESTR_2 = "\x00\x00\x00\x07ssh-rsa\x00\x00\x00\x01#\x00\x00\x00\x81\x00\xd3\x8fV\xea\x07\x85\xa6k%\x8d<\x1f\xbc\x8dT\x98\xa5\x96$\xf3E#\xbe>\xbc\xd2\x93\x93\x87f\xceD\x18\xdb \x0c\xb3\xa1a\x96\xf8e#\xcc\xacS\x8a#\xefVlE\x83\x1epv\xc1o\x17M\xef\xdf\x89DUXL\xa6\x8b\xaa<\x06\x10\xd7\x93w\xec\xaf\xe2\xaf\x95\xd8\xfb\xd9\xbfw\xcb\x9f0)#y{\x10\x90\xaa\x85l\tPru\x8c\t\x19\xce\xa0\xf1\xd2\xdc\x8e/\x8b\xa8f\x9c0\xdey\x84\xd2F\xf7\xcbmm\x1f\x87"  # noqa
+TEST_KEY_BYTESTR_3 = "\x00\x00\x00\x07ssh-rsa\x00\x00\x00\x01#\x00\x00\x00\x00ӏV\x07k%<\x1fT$E#>ғfD\x18 \x0cae#̬S#VlE\x1epvo\x17M߉DUXL<\x06\x10דw\u2bd5ٿw˟0)#y{\x10l\tPru\t\x19Π\u070e/f0yFmm\x1f"  # noqa
 
 
 class KeyTest(unittest.TestCase):
@@ -133,7 +132,7 @@ class KeyTest(unittest.TestCase):
 
     def test_generate_key_bytes(self):
         key = util.generate_key_bytes(md5, x1234, "happy birthday", 30)
-        exp = b"\x61\xE1\xF2\x72\xF4\xC1\xC4\x56\x15\x86\xBD\x32\x24\x98\xC0\xE9\x24\x67\x27\x80\xF4\x7B\xB3\x7D\xDA\x7D\x54\x01\x9E\x64"
+        exp = b"\x61\xE1\xF2\x72\xF4\xC1\xC4\x56\x15\x86\xBD\x32\x24\x98\xC0\xE9\x24\x67\x27\x80\xF4\x7B\xB3\x7D\xDA\x7D\x54\x01\x9E\x64"  # noqa
         self.assertEqual(exp, key)
 
     def test_load_rsa(self):
@@ -479,7 +478,7 @@ class KeyTest(unittest.TestCase):
 
     def test_ed25519_nonbytes_password(self):
         # https://github.com/paramiko/paramiko/issues/1039
-        key = Ed25519Key.from_private_key_file(
+        Ed25519Key.from_private_key_file(
             _support("test_ed25519_password.key"),
             # NOTE: not a bytes. Amusingly, the test above for same key DOES
             # explicitly cast to bytes...code smell!
@@ -528,7 +527,7 @@ class KeyTest(unittest.TestCase):
         # Delve into blob contents, for test purposes
         msg = Message(key.public_blob.key_blob)
         self.assertEqual(msg.get_text(), "ssh-rsa-cert-v01@openssh.com")
-        nonce = msg.get_string()
+        msg.get_string()
         e = msg.get_mpint()
         n = msg.get_mpint()
         self.assertEqual(e, key.public_numbers.e)
diff --git a/tests/test_sftp.py b/tests/test_sftp.py
index 97541f80..395942cc 100644
--- a/tests/test_sftp.py
+++ b/tests/test_sftp.py
@@ -26,23 +26,18 @@ do test file operations in (so no existing files will be harmed).
 import os
 import socket
 import sys
-import threading
-import unittest
 import warnings
 from binascii import hexlify
 from tempfile import mkstemp
 
 import pytest
 
-import paramiko
-import paramiko.util
 from paramiko.py3compat import PY2, b, u, StringIO
 from paramiko.common import o777, o600, o666, o644
 from paramiko.sftp_attr import SFTPAttributes
 
 from .util import needs_builtin
-from .stub_sftp import StubServer, StubSFTPServer
-from .util import _support, slow
+from .util import slow
 
 
 ARTICLE = """
@@ -74,14 +69,21 @@ decreased compared with chicken.
 
 
 # Here is how unicode characters are encoded over 1 to 6 bytes in utf-8
-# U-00000000 - U-0000007F: 0xxxxxxx
-# U-00000080 - U-000007FF: 110xxxxx 10xxxxxx
-# U-00000800 - U-0000FFFF: 1110xxxx 10xxxxxx 10xxxxxx
-# U-00010000 - U-001FFFFF: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
-# U-00200000 - U-03FFFFFF: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
-# U-04000000 - U-7FFFFFFF: 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+# U-00000000 - U-0000007F:
+#   0xxxxxxx
+# U-00000080 - U-000007FF:
+#   110xxxxx 10xxxxxx
+# U-00000800 - U-0000FFFF:
+#   1110xxxx 10xxxxxx 10xxxxxx
+# U-00010000 - U-001FFFFF:
+#   11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+# U-00200000 - U-03FFFFFF:
+#   111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+# U-04000000 - U-7FFFFFFF:
+#   1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
 # Note that: hex(int('11000011',2)) == '0xc3'
-# Thus, the following 2-bytes sequence is not valid utf8: "invalid continuation byte"
+# Thus, the following 2-bytes sequence is not valid utf8: "invalid continuation
+# byte"
 NON_UTF8_DATA = b"\xC3\xC3"
 
 unicode_folder = u"\u00fcnic\u00f8de" if PY2 else "\u00fcnic\u00f8de"
@@ -347,10 +349,10 @@ class TestSFTP(object):
 
     def test_readline_seek(self, sftp):
         """
-        create a text file and write a bunch of text into it.  then count the lines
-        in the file, and seek around to retrieve particular lines.  this should
-        verify that read buffering and 'tell' work well together, and that read
-        buffering is reset on 'seek'.
+        create a text file and write a bunch of text into it.  then count the
+        lines in the file, and seek around to retrieve particular lines.  this
+        should verify that read buffering and 'tell' work well together, and
+        that read buffering is reset on 'seek'.
         """
         try:
             with sftp.open(sftp.FOLDER + "/duck.txt", "w") as f:
@@ -370,17 +372,14 @@ class TestSFTP(object):
                 f.seek(pos_list[17], f.SEEK_SET)
                 assert f.readline()[:4] == "duck"
                 f.seek(pos_list[10], f.SEEK_SET)
-                assert (
-                    f.readline()
-                    == "duck types were equally resistant to exogenous insulin compared with chicken.\n"
-                )
+                expected = "duck types were equally resistant to exogenous insulin compared with chicken.\n"  # noqa
+                assert f.readline() == expected
         finally:
             sftp.remove(sftp.FOLDER + "/duck.txt")
 
     def test_write_seek(self, sftp):
         """
-        create a text file, seek back and change part of it, and verify that the
-        changes worked.
+        Create a text file, seek back, change it, and verify.
         """
         try:
             with sftp.open(sftp.FOLDER + "/testing.txt", "w") as f:
@@ -577,10 +576,8 @@ class TestSFTP(object):
                     == u(hexlify(sum)).upper()
                 )
                 sum = f.check("md5", 0, 0, 510)
-                assert (
-                    u(hexlify(sum)).upper()
-                    == "EB3B45B8CD55A0707D99B177544A319F373183D241432BB2157AB9E46358C4AC90370B5CADE5D90336FC1716F90B36D6"
-                )  # noqa
+                expected = "EB3B45B8CD55A0707D99B177544A319F373183D241432BB2157AB9E46358C4AC90370B5CADE5D90336FC1716F90B36D6"  # noqa
+                assert u(hexlify(sum)).upper() == expected
         finally:
             sftp.unlink(sftp.FOLDER + "/kitty.txt")
 
@@ -675,7 +672,7 @@ class TestSFTP(object):
         """
         verify that chdir/getcwd work.
         """
-        assert sftp.getcwd() == None
+        assert sftp.getcwd() is None
         root = sftp.normalize(".")
         if root[-1] != "/":
             root += "/"
@@ -770,7 +767,7 @@ class TestSFTP(object):
         try:
             with sftp.open("%s/write_buffer" % sftp.FOLDER, "wb") as f:
                 for offset in range(0, len(data), 8):
-                    f.write(buffer(data, offset, 8))
+                    f.write(buffer(data, offset, 8))  # noqa
 
             with sftp.open("%s/write_buffer" % sftp.FOLDER, "rb") as f:
                 assert f.read() == data
diff --git a/tests/test_sftp_big.py b/tests/test_sftp_big.py
index 737eb2e2..fc556faf 100644
--- a/tests/test_sftp_big.py
+++ b/tests/test_sftp_big.py
@@ -23,12 +23,10 @@ a real actual sftp server is contacted, and a new folder is created there to
 do test file operations in (so no existing files will be harmed).
 """
 
-import os
 import random
 import struct
 import sys
 import time
-import unittest
 
 from paramiko.common import o660
 
@@ -122,7 +120,8 @@ class TestBigSFTP(object):
                 file_size = f.stat().st_size
                 f.prefetch(file_size)
 
-                # read on odd boundaries to make sure the bytes aren't getting scrambled
+                # read on odd boundaries to make sure the bytes aren't getting
+                # scrambled
                 n = 0
                 k2blob = kblob + kblob
                 chunk = 629
diff --git a/tests/test_ssh_gss.py b/tests/test_ssh_gss.py
index 4d354059..d8c151f9 100644
--- a/tests/test_ssh_gss.py
+++ b/tests/test_ssh_gss.py
@@ -148,7 +148,7 @@ class GSSAuthTest(unittest.TestCase):
 
     def test_auth_trickledown(self):
         """
-        Failed gssapi-with-mic auth doesn't prevent subsequent key auth from succeeding
+        Failed gssapi-with-mic doesn't prevent subsequent key from succeeding
         """
         self.hostname = (
             "this_host_does_not_exists_and_causes_a_GSSAPI-exception"
diff --git a/tests/test_transport.py b/tests/test_transport.py
index 82bc324f..ad267e28 100644
--- a/tests/test_transport.py
+++ b/tests/test_transport.py
@@ -28,36 +28,32 @@ import socket
 import time
 import threading
 import random
-from hashlib import sha1
 import unittest
 from mock import Mock
 
 from paramiko import (
-    Transport,
-    SecurityOptions,
-    ServerInterface,
-    RSAKey,
-    DSSKey,
-    SSHException,
+    AuthHandler,
     ChannelException,
+    DSSKey,
     Packetizer,
-    Channel,
-    AuthHandler,
+    RSAKey,
+    SSHException,
+    SecurityOptions,
+    ServerInterface,
+    Transport,
 )
 from paramiko import AUTH_FAILED, AUTH_SUCCESSFUL
 from paramiko import OPEN_SUCCEEDED, OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED
 from paramiko.common import (
-    MSG_KEXINIT,
-    cMSG_CHANNEL_WINDOW_ADJUST,
-    cMSG_UNIMPLEMENTED,
+    DEFAULT_MAX_PACKET_SIZE,
+    DEFAULT_WINDOW_SIZE,
+    MAX_WINDOW_SIZE,
     MIN_PACKET_SIZE,
     MIN_WINDOW_SIZE,
-    MAX_WINDOW_SIZE,
-    DEFAULT_WINDOW_SIZE,
-    DEFAULT_MAX_PACKET_SIZE,
-    MSG_NAMES,
-    MSG_UNIMPLEMENTED,
+    MSG_KEXINIT,
     MSG_USERAUTH_SUCCESS,
+    cMSG_CHANNEL_WINDOW_ADJUST,
+    cMSG_UNIMPLEMENTED,
 )
 from paramiko.py3compat import bytes, byte_chr
 from paramiko.message import Message
@@ -212,12 +208,12 @@ class TransportTest(unittest.TestCase):
         o.compression = o.compression
 
     def test_compute_key(self):
-        self.tc.K = 123281095979686581523377256114209720774539068973101330872763622971399429481072519713536292772709507296759612401802191955568143056534122385270077606457721553469730659233569339356140085284052436697480759510519672848743794433460113118986816826624865291116513647975790797391795651716378444844877749505443714557929
-        self.tc.H = b"\x0C\x83\x07\xCD\xE6\x85\x6F\xF3\x0B\xA9\x36\x84\xEB\x0F\x04\xC2\x52\x0E\x9E\xD3"
+        self.tc.K = 123281095979686581523377256114209720774539068973101330872763622971399429481072519713536292772709507296759612401802191955568143056534122385270077606457721553469730659233569339356140085284052436697480759510519672848743794433460113118986816826624865291116513647975790797391795651716378444844877749505443714557929  # noqa
+        self.tc.H = b"\x0C\x83\x07\xCD\xE6\x85\x6F\xF3\x0B\xA9\x36\x84\xEB\x0F\x04\xC2\x52\x0E\x9E\xD3"  # noqa
         self.tc.session_id = self.tc.H
         key = self.tc._compute_key("C", 32)
         self.assertEqual(
-            b"207E66594CA87C44ECCBA3B3CD39FDDB378E6FDB0F97C54B2AA0CFBF900CD995",
+            b"207E66594CA87C44ECCBA3B3CD39FDDB378E6FDB0F97C54B2AA0CFBF900CD995",  # noqa
             hexlify(key).upper(),
         )
 
@@ -379,7 +375,7 @@ class TransportTest(unittest.TestCase):
         """
         self.setup_test_server()
         try:
-            chan = self.tc.open_channel("bogus")
+            self.tc.open_channel("bogus")
             self.fail("expected exception")
         except ChannelException as e:
             self.assertTrue(e.code == OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED)
@@ -510,7 +506,8 @@ class TransportTest(unittest.TestCase):
         bytes2 = self.tc.packetizer._Packetizer__sent_bytes
         block_size = self.tc._cipher_info[self.tc.local_cipher]["block-size"]
         mac_size = self.tc._mac_info[self.tc.local_mac]["size"]
-        # tests show this is actually compressed to *52 bytes*!  including packet overhead!  nice!! :)
+        # tests show this is actually compressed to *52 bytes*!  including
+        # packet overhead!  nice!! :)
         self.assertTrue(bytes2 - bytes < 1024)
         self.assertEqual(16 + block_size + mac_size, bytes2 - bytes)
 
@@ -563,7 +560,7 @@ class TransportTest(unittest.TestCase):
         self.setup_test_server()
         chan = self.tc.open_session()
         chan.exec_command("yes")
-        schan = self.ts.accept(1.0)
+        self.ts.accept(1.0)
 
         requested = []
 
@@ -602,7 +599,7 @@ class TransportTest(unittest.TestCase):
         self.setup_test_server()
         chan = self.tc.open_session()
         chan.exec_command("yes")
-        schan = self.ts.accept(1.0)
+        self.ts.accept(1.0)
 
         # open a port on the "server" that the client will ask to forward to.
         greeting_server = socket.socket()
@@ -691,7 +688,8 @@ class TransportTest(unittest.TestCase):
 
     def test_rekey_deadlock(self):
         """
-        Regression test for deadlock when in-transit messages are received after MSG_KEXINIT is sent
+        Regression test for deadlock when in-transit messages are received
+        after MSG_KEXINIT is sent
 
         Note: When this test fails, it may leak threads.
         """
@@ -714,12 +712,15 @@ class TransportTest(unittest.TestCase):
         #      MSG_KEXINIT to the remote host.
         #
         # On the remote host (using any SSH implementation):
-        #   5. The MSG_CHANNEL_DATA is received, and MSG_CHANNEL_WINDOW_ADJUST is sent.
-        #   6. The MSG_KEXINIT is received, and a corresponding MSG_KEXINIT is sent.
+        #   5. The MSG_CHANNEL_DATA is received, and MSG_CHANNEL_WINDOW_ADJUST
+        #      is sent.
+        #   6. The MSG_KEXINIT is received, and a corresponding MSG_KEXINIT is
+        #      sent.
         #
         # In the main thread:
         #   7. The user's program calls Channel.send().
-        #   8. Channel.send acquires Channel.lock, then calls Transport._send_user_message().
+        #   8. Channel.send acquires Channel.lock, then calls
+        #      Transport._send_user_message().
         #   9. Transport._send_user_message waits for Transport.clear_to_send
         #      to be set (i.e., it waits for re-keying to complete).
         #      Channel.lock is still held.
@@ -969,11 +970,11 @@ class TransportTest(unittest.TestCase):
             # send() accepts buffer instances
             sent = 0
             while sent < len(data):
-                sent += chan.send(buffer(data, sent, 8))
+                sent += chan.send(buffer(data, sent, 8))  # noqa
             self.assertEqual(sfile.read(len(data)), data)
 
             # sendall() accepts a buffer instance
-            chan.sendall(buffer(data))
+            chan.sendall(buffer(data))  # noqa
             self.assertEqual(sfile.read(len(data)), data)
 
     @needs_builtin("memoryview")
diff --git a/tests/test_util.py b/tests/test_util.py
index 705baa14..a99dbea8 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -26,9 +26,11 @@ import os
 from hashlib import sha1
 import unittest
 
+import paramiko
 import paramiko.util
+from paramiko import SSHConfig
 from paramiko.util import lookup_ssh_host_config as host_config, safe_string
-from paramiko.py3compat import StringIO, byte_ord, b
+from paramiko.py3compat import StringIO, byte_ord
 
 
 # Note some lines in this configuration have trailing spaces on purpose
@@ -62,16 +64,12 @@ BGQ3GQ/Fc7SX6gkpXkwcZryoi4kNFhHu5LvHcZPdxXV1D+uTMfGS1eyd2Yz/DoNWXNAl8TI0cAsW\
 """
 
 
-# for test 1:
-from paramiko import *
-
-
 class UtilTest(unittest.TestCase):
     def test_import(self):
         """
         verify that all the classes can be imported from paramiko.
         """
-        symbols = list(globals().keys())
+        symbols = paramiko.__all__
         self.assertTrue("Transport" in symbols)
         self.assertTrue("SSHClient" in symbols)
         self.assertTrue("MissingHostKeyPolicy" in symbols)
@@ -172,7 +170,7 @@ class UtilTest(unittest.TestCase):
         hex = "".join(["%02x" % byte_ord(c) for c in x])
         self.assertEqual(
             hex,
-            "9110e2f6793b69363e58173e9436b13a5a4b339005741d5c680e505f57d871347b4239f14fb5c46e857d5e100424873ba849ac699cea98d729e57b3e84378e8b",
+            "9110e2f6793b69363e58173e9436b13a5a4b339005741d5c680e505f57d871347b4239f14fb5c46e857d5e100424873ba849ac699cea98d729e57b3e84378e8b",  # noqa
         )
 
     def test_host_keys(self):