Drop dependency on six

Author: nvie

git/compat.py

@@ -8,7 +8,6 @@
 # flake8: noqa
 
 import sys
-import six
 
 from gitdb.utils.compat import (
     PY3,
@@ -34,6 +33,7 @@ def bchr(n):
         return bytes([n])
     def mviter(d):
         return d.values()
+    range = xrange
     unicode = str
 else:
     FileType = file
@@ -44,6 +44,7 @@ def mviter(d):
     byte_ord = ord
     bchr = chr
     unicode = unicode
+    range = xrange
     def mviter(d):
         return d.itervalues()
 
@@ -52,9 +53,9 @@ def mviter(d):
 
 def safe_decode(s):
     """Safely decodes a binary string to unicode"""
-    if isinstance(s, six.text_type):
+    if isinstance(s, unicode):
         return s
-    elif isinstance(s, six.binary_type):
+    elif isinstance(s, bytes):
         if PRE_PY27:
             # Python 2.6 does not support the `errors` argument, so we cannot
             # control the replacement of unsafe chars in it.

git/repo/base.py

@@ -54,12 +54,12 @@
     defenc,
     PY3,
     safe_decode,
+    range,
 )
 
 import os
 import sys
 import re
-from six.moves import range
 
 DefaultDBType = GitCmdObjectDB
 if sys.version_info[:2] < (2, 5):     # python 2.4 compatiblity