core: Various Python 3 compatibility fixes.

Conflicts:
	src/httpserver.py

src/commands.py

@@ -870,6 +870,7 @@ class first(context):
                 spec(irc, msg, args, state)
                 return
             except Exception, e:
+                e2 = e # 'e' is local.
                 errored = state.errored
                 state.errored = False
                 continue
@@ -877,7 +878,7 @@ class first(context):
             state.args.append(self.default)
         else:
             state.errored = errored
-            raise e
+            raise e2
 
 class reverse(context):
     def __call__(self, irc, msg, args, state):

src/httpserver.py

@@ -138,7 +138,7 @@ class SupyHTTPServerCallback:
         self.send_header('Content_type', 'text/plain; charset=utf-8')
         self.send_header('Content-Length', len(self.defaultResponse))
         self.end_headers()
-        self.wfile.write(self.defaultResponse)
+        self.wfile.write(self.defaultResponse.encode())
 
     doPost = doHead = doGet
 
@@ -159,7 +159,7 @@ class Supy404(SupyHTTPServerCallback):
         self.send_header('Content_type', 'text/plain; charset=utf-8')
         self.send_header('Content-Length', len(self.response))
         self.end_headers()
-        self.wfile.write(self.response)
+        self.wfile.write(self.response.encode())
 
     doPost = doHead = doGet
 

src/test.py

@@ -38,7 +38,6 @@ import urllib
 import httplib
 import unittest
 import threading
-import StringIO
 
 import supybot.log as log
 import supybot.i18n as i18n
@@ -568,8 +567,12 @@ class HTTPPluginTestCase(PluginTestCase):
 
     def request(self, url, method='GET', read=True, data={}):
         assert url.startswith('/')
-        wfile = StringIO.StringIO()
-        rfile = StringIO.StringIO()
+        try:
+            from io import BytesIO as StringIO
+        except ImportError:
+            from StringIO import StringIO
+        wfile = StringIO()
+        rfile = StringIO()
         connection = FakeHTTPConnection(wfile, rfile)
         connection.putrequest(method, url)
         connection.endheaders()

src/utils/str.py

@@ -455,7 +455,8 @@ def format(s, *args, **kwargs):
             return has(args.pop())
         elif char == 'L':
             t = args.pop()
-            if isinstance(t, list):
+            if isinstance(t, list) or (sys.version_info[0] >= 3 and
+                    (isinstance(t, map) or isinstance(t, filter))):
                 return commaAndify(t)
             elif isinstance(t, tuple) and len(t) == 2:
                 if not isinstance(t[0], list):