1 files changed, 31 insertions, 19 deletions

diff --git a/demos/demo_simple.py b/demos/demo_simple.py
index 9def57f8..5dd4f6c1 100644
--- a/demos/demo_simple.py
+++ b/demos/demo_simple.py
@@ -28,6 +28,7 @@ import traceback
 from paramiko.py3compat import input
 
 import paramiko
+
 try:
     import interactive
 except ImportError:
@@ -35,39 +36,43 @@ except ImportError:
 
 
 # setup logging
-paramiko.util.log_to_file('demo_simple.log')
+paramiko.util.log_to_file("demo_simple.log")
 # Paramiko client configuration
-UseGSSAPI = paramiko.GSS_AUTH_AVAILABLE             # enable "gssapi-with-mic" authentication, if supported by your python installation
-DoGSSAPIKeyExchange = paramiko.GSS_AUTH_AVAILABLE   # enable "gssapi-kex" key exchange, if supported by your python installation
+UseGSSAPI = (
+    paramiko.GSS_AUTH_AVAILABLE
+)  # enable "gssapi-with-mic" authentication, if supported by your python installation
+DoGSSAPIKeyExchange = (
+    paramiko.GSS_AUTH_AVAILABLE
+)  # enable "gssapi-kex" key exchange, if supported by your python installation
 # UseGSSAPI = False
 # DoGSSAPIKeyExchange = False
 port = 22
 
 # get hostname
-username = ''
+username = ""
 if len(sys.argv) > 1:
     hostname = sys.argv[1]
-    if hostname.find('@') >= 0:
-        username, hostname = hostname.split('@')
+    if hostname.find("@") >= 0:
+        username, hostname = hostname.split("@")
 else:
-    hostname = input('Hostname: ')
+    hostname = input("Hostname: ")
 if len(hostname) == 0:
-    print('*** Hostname required.')
+    print("*** Hostname required.")
     sys.exit(1)
 
-if hostname.find(':') >= 0:
-    hostname, portstr = hostname.split(':')
+if hostname.find(":") >= 0:
+    hostname, portstr = hostname.split(":")
     port = int(portstr)
 
 
 # get username
-if username == '':
+if username == "":
     default_username = getpass.getuser()
-    username = input('Username [%s]: ' % default_username)
+    username = input("Username [%s]: " % default_username)
     if len(username) == 0:
         username = default_username
 if not UseGSSAPI and not DoGSSAPIKeyExchange:
-    password = getpass.getpass('Password for %s@%s: ' % (username, hostname))
+    password = getpass.getpass("Password for %s@%s: " % (username, hostname))
 
 
 # now, connect and use paramiko Client to negotiate SSH2 across the connection
@@ -75,27 +80,34 @@ try:
     client = paramiko.SSHClient()
     client.load_system_host_keys()
     client.set_missing_host_key_policy(paramiko.WarningPolicy())
-    print('*** Connecting...')
+    print("*** Connecting...")
     if not UseGSSAPI and not DoGSSAPIKeyExchange:
         client.connect(hostname, port, username, password)
     else:
         try:
-            client.connect(hostname, port, username, gss_auth=UseGSSAPI,
-                           gss_kex=DoGSSAPIKeyExchange)
+            client.connect(
+                hostname,
+                port,
+                username,
+                gss_auth=UseGSSAPI,
+                gss_kex=DoGSSAPIKeyExchange,
+            )
         except Exception:
             # traceback.print_exc()
-            password = getpass.getpass('Password for %s@%s: ' % (username, hostname))
+            password = getpass.getpass(
+                "Password for %s@%s: " % (username, hostname)
+            )
             client.connect(hostname, port, username, password)
 
     chan = client.invoke_shell()
     print(repr(client.get_transport()))
-    print('*** Here we go!\n')
+    print("*** Here we go!\n")
     interactive.interactive_shell(chan)
     chan.close()
     client.close()
 
 except Exception as e:
-    print('*** Caught exception: %s: %s' % (e.__class__, e))
+    print("*** Caught exception: %s: %s" % (e.__class__, e))
     traceback.print_exc()
     try:
         client.close()