Use six in pkg_resources.

--HG--
branch : feature/issue-229

pkg_resources/__init__.py

@@ -37,7 +37,6 @@ import plistlib
 import email.parser
 import tempfile
 import textwrap
-import itertools
 from pkgutil import get_importer
 
 try:
@@ -46,23 +45,8 @@ except ImportError:
     # Python 3.2 compatibility
     import imp as _imp
 
-PY3 = sys.version_info > (3,)
-PY2 = not PY3
-
-if PY3:
-    from urllib.parse import urlparse, urlunparse
-
-if PY2:
-    from urlparse import urlparse, urlunparse
-    filter = itertools.ifilter
-    map = itertools.imap
-
-if PY3:
-    string_types = str,
-else:
-    string_types = str, eval('unicode')
-
-iteritems = (lambda i: i.items()) if PY3 else lambda i: i.iteritems()
+from pkg_resources.extern import six
+from pkg_resources.extern.six.moves import urllib
 
 # capture these to bypass sandboxing
 from os import utime
@@ -92,6 +76,9 @@ __import__('pkg_resources.extern.packaging.version')
 __import__('pkg_resources.extern.packaging.specifiers')
 
 
+filter = six.moves.filter
+map = six.moves.map
+
 if (3, 0) < sys.version_info < (3, 3):
     msg = (
         "Support for Python 3.0-3.2 has been dropped. Future versions "
@@ -549,7 +536,7 @@ run_main = run_script
 
 def get_distribution(dist):
     """Return a current distribution object for a Requirement or string"""
-    if isinstance(dist, string_types):
+    if isinstance(dist, six.string_types):
         dist = Requirement.parse(dist)
     if isinstance(dist, Requirement):
         dist = get_provider(dist)
@@ -2297,7 +2284,7 @@ def _set_parent_ns(packageName):
 
 def yield_lines(strs):
     """Yield non-empty/non-comment lines of a string or sequence"""
-    if isinstance(strs, string_types):
+    if isinstance(strs, six.string_types):
         for s in strs.splitlines():
             s = s.strip()
             # skip blank lines/comments
@@ -2464,9 +2451,9 @@ class EntryPoint(object):
 def _remove_md5_fragment(location):
     if not location:
         return ''
-    parsed = urlparse(location)
+    parsed = urllib.parse.urlparse(location)
     if parsed[-1].startswith('md5='):
-        return urlunparse(parsed[:-1] + ('',))
+        return urllib.parse.urlunparse(parsed[:-1] + ('',))
     return location
 
 

pkg_resources/tests/test_resources.py

@@ -244,9 +244,8 @@ class TestWorkingSet:
         with pytest.raises(VersionConflict) as vc:
             ws.resolve(parse_requirements("Foo\nBar\n"))
 
-        msg = "Baz 1.0 is installed but Baz==2.0 is required by {'Bar'}"
-        if pkg_resources.PY2:
-            msg = msg.replace("{'Bar'}", "set(['Bar'])")
+        msg = "Baz 1.0 is installed but Baz==2.0 is required by "
+        msg += repr(set(['Bar']))
         assert vc.value.report() == msg