core: replace UTF8_CODEC with encodings.utf_8.encode() function.

mitogen/core.py

@@ -37,6 +37,7 @@ bootstrap implementation sent to every new slave context.
 import binascii
 import collections
 import encodings.latin_1
+import encodings.utf_8
 import errno
 import fcntl
 import itertools
@@ -102,10 +103,9 @@ LOG = logging.getLogger('mitogen')
 IOLOG = logging.getLogger('mitogen.io')
 IOLOG.setLevel(logging.INFO)
 
-LATIN1_CODEC = encodings.latin_1.Codec()
 # str.encode() may take import lock. Deadlock possible if broker calls
 # .encode() on behalf of thread currently waiting for module.
-UTF8_CODEC = encodings.latin_1.Codec()
+LATIN1_CODEC = encodings.latin_1.Codec()
 
 _v = False
 _vv = False
@@ -288,7 +288,7 @@ class Kwargs(dict):
         def __init__(self, dct):
             for k, v in dct.iteritems():
                 if type(k) is unicode:
-                    k, _ = UTF8_CODEC.encode(k)
+                    k, _ = encodings.utf_8.encode(k)
                 self[k] = v
 
     def __repr__(self):
@@ -782,7 +782,7 @@ class Message(object):
         """
         Syntax helper to construct a dead message.
         """
-        kwargs['data'], _ = UTF8_CODEC.encode(reason or u'')
+        kwargs['data'], _ = encodings.utf_8.encode(reason or u'')
         return cls(reply_to=IS_DEAD, **kwargs)
 
     @classmethod
@@ -1381,7 +1381,7 @@ class Importer(object):
 
         if mod.__package__ and not PY3:
             # 2.x requires __package__ to be exactly a string.
-            mod.__package__, _ = UTF8_CODEC.encode(mod.__package__)
+            mod.__package__, _ = encodings.utf_8.encode(mod.__package__)
 
         source = self.get_source(fullname)
         try: