--- sneaky.py (original)
+++ sneaky.py (refactored)
@@ -112,8 +112,8 @@
 import traceback
 import copy
 
-from cStringIO import StringIO
-from Queue import Queue
+from io import StringIO
+from queue import Queue
 regex_head = re.compile('^((http|https|HTTP|HTTPS)\://[^/]+)?(?P<method>\w+)\s+(?P<uri>\S+)\s+(?P<protocol>\S+)')
 regex_header = re.compile('\s*(?P<key>.*?)\s*\:\s*(?P<value>.*?)\s*$')
 regex_chunk = re.compile('^(?P<size>\w+)')
@@ -255,7 +255,7 @@
             if not match:
                 continue
             key = match.group('key').upper().replace('-','_')
-            if isinstance(key,unicode):
+            if isinstance(key,str):
                 key = key.encode('ISO-8859-1')
             value = match.group('value')
             try:
@@ -300,7 +300,7 @@
                     client_socket.sendall('%x\r\n%s\r\n' % (len(data),data))
                 else:
                     client_socket.sendall(data)
-            except socket.error, e:
+            except socket.error as e:
                 if e.args[0] not in socket_errors_to_ignore:
                     raise
         if chunked:
@@ -383,7 +383,7 @@
 
     def start(self):
         """starts the server"""
-        print 'Experimental "Sneaky" WSGI web server. Starting...'
+        print('Experimental "Sneaky" WSGI web server. Starting...')
         for thread in Worker.threads:
             thread.start()
         self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
@@ -454,7 +454,7 @@
 
     address = ([a for a in sys.argv[1:] if a[0]!='-'] + ['127.0.0.1:8000'])[0]
 
-    print 'serving from: '+address
+    print('serving from: '+address)
 
     server = Sneaky(address, # the ip:port
                     test_wsgi_app,  # the SWGI application