Remove dependency on six to make package lighter (#331)

packaging/requirements.py

@@ -5,16 +5,22 @@
 
 import string
 import re
+import sys
 
 from pyparsing import stringStart, stringEnd, originalTextFor, ParseException
 from pyparsing import ZeroOrMore, Word, Optional, Regex, Combine
 from pyparsing import Literal as L  # noqa
-from six.moves.urllib import parse as urlparse
 
 from ._typing import TYPE_CHECKING
 from .markers import MARKER_EXPR, Marker
 from .specifiers import LegacySpecifier, Specifier, SpecifierSet
 
+if sys.version_info[0] >= 3:
+    from urllib import parse as urlparse  # pragma: no cover
+else:  # pragma: no cover
+    import urlparse
+
+
 if TYPE_CHECKING:  # pragma: no cover
     from typing import List
 

setup.py

@@ -49,7 +49,7 @@
     author=about["__author__"],
     author_email=about["__email__"],
     python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
-    install_requires=["pyparsing>=2.0.2", "six"],  # Needed to avoid issue #91
+    install_requires=["pyparsing>=2.0.2"],  # Needed to avoid issue #91
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",