1 files changed, 43 insertions, 33 deletions

diff --git a/demos/demo_sftp.py b/demos/demo_sftp.py
index 2cb44701..7f6a002e 100644
--- a/demos/demo_sftp.py
+++ b/demos/demo_sftp.py
@@ -32,38 +32,38 @@ from paramiko.py3compat import input
 
 
 # setup logging
-paramiko.util.log_to_file('demo_sftp.log')
+paramiko.util.log_to_file("demo_sftp.log")
 
 # Paramiko client configuration
-UseGSSAPI = True             # enable GSS-API / SSPI authentication
+UseGSSAPI = True  # enable GSS-API / SSPI authentication
 DoGSSAPIKeyExchange = True
 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:
-    password = getpass.getpass('Password for %s@%s: ' % (username, hostname))
+    password = getpass.getpass("Password for %s@%s: " % (username, hostname))
 else:
     password = None
 
@@ -72,59 +72,69 @@ else:
 hostkeytype = None
 hostkey = None
 try:
-    host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
+    host_keys = paramiko.util.load_host_keys(
+        os.path.expanduser("~/.ssh/known_hosts")
+    )
 except IOError:
     try:
         # try ~/ssh/ too, because windows can't have a folder named ~/.ssh/
-        host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/ssh/known_hosts'))
+        host_keys = paramiko.util.load_host_keys(
+            os.path.expanduser("~/ssh/known_hosts")
+        )
     except IOError:
-        print('*** Unable to open host keys file')
+        print("*** Unable to open host keys file")
         host_keys = {}
 
 if hostname in host_keys:
     hostkeytype = host_keys[hostname].keys()[0]
     hostkey = host_keys[hostname][hostkeytype]
-    print('Using host key of type %s' % hostkeytype)
+    print("Using host key of type %s" % hostkeytype)
 
 
 # now, connect and use paramiko Transport to negotiate SSH2 across the connection
 try:
     t = paramiko.Transport((hostname, Port))
-    t.connect(hostkey, username, password, gss_host=socket.getfqdn(hostname),
-              gss_auth=UseGSSAPI, gss_kex=DoGSSAPIKeyExchange)
+    t.connect(
+        hostkey,
+        username,
+        password,
+        gss_host=socket.getfqdn(hostname),
+        gss_auth=UseGSSAPI,
+        gss_kex=DoGSSAPIKeyExchange,
+    )
     sftp = paramiko.SFTPClient.from_transport(t)
 
     # dirlist on remote host
-    dirlist = sftp.listdir('.')
+    dirlist = sftp.listdir(".")
     print("Dirlist: %s" % dirlist)
 
     # copy this demo onto the server
     try:
         sftp.mkdir("demo_sftp_folder")
     except IOError:
-        print('(assuming demo_sftp_folder/ already exists)')
-    with sftp.open('demo_sftp_folder/README', 'w') as f:
-        f.write('This was created by demo_sftp.py.\n')
-    with open('demo_sftp.py', 'r') as f:
+        print("(assuming demo_sftp_folder/ already exists)")
+    with sftp.open("demo_sftp_folder/README", "w") as f:
+        f.write("This was created by demo_sftp.py.\n")
+    with open("demo_sftp.py", "r") as f:
         data = f.read()
-    sftp.open('demo_sftp_folder/demo_sftp.py', 'w').write(data)
-    print('created demo_sftp_folder/ on the server')
-    
+    sftp.open("demo_sftp_folder/demo_sftp.py", "w").write(data)
+    print("created demo_sftp_folder/ on the server")
+
     # copy the README back here
-    with sftp.open('demo_sftp_folder/README', 'r') as f:
+    with sftp.open("demo_sftp_folder/README", "r") as f:
         data = f.read()
-    with open('README_demo_sftp', 'w') as f:
+    with open("README_demo_sftp", "w") as f:
         f.write(data)
-    print('copied README back here')
-    
+    print("copied README back here")
+
     # BETTER: use the get() and put() methods
-    sftp.put('demo_sftp.py', 'demo_sftp_folder/demo_sftp.py')
-    sftp.get('demo_sftp_folder/README', 'README_demo_sftp')
+    sftp.put("demo_sftp.py", "demo_sftp_folder/demo_sftp.py")
+    sftp.get("demo_sftp_folder/README", "README_demo_sftp")
 
     t.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:
         t.close()