python 3 migration

venv/lib/python3.6/site-packages/gitdb/utils/compat.py

@@ -0,0 +1,43 @@
+import sys
+
+PY3 = sys.version_info[0] == 3
+
+try:
+    from itertools import izip
+    xrange = xrange
+except ImportError:
+    # py3
+    izip = zip
+    xrange = range
+# end handle python version
+
+try:
+    # Python 2
+    buffer = buffer
+    memoryview = buffer
+    # Assume no memory view ...
+    def to_bytes(i):
+        return i
+except NameError:
+    # Python 3 has no `buffer`; only `memoryview`
+    # However, it's faster to just slice the object directly, maybe it keeps a view internally
+    def buffer(obj, offset, size=None):
+        if size is None:
+            # return memoryview(obj)[offset:]
+            return obj[offset:]
+        else:
+            # return memoryview(obj)[offset:offset+size]
+            return obj[offset:offset + size]
+    # end buffer reimplementation
+    # smmap can return memory view objects, which can't be compared as buffers/bytes can ... 
+    def to_bytes(i):
+        if isinstance(i, memoryview):
+            return i.tobytes()
+        return i
+
+    memoryview = memoryview
+
+try:
+    MAXSIZE = sys.maxint
+except AttributeError:
+    MAXSIZE = sys.maxsize

venv/lib/python3.6/site-packages/gitdb/utils/encoding.py

@@ -0,0 +1,31 @@
+from gitdb.utils import compat
+
+if compat.PY3:
+    string_types = (str, )
+    text_type = str
+else:
+    string_types = (basestring, )
+    text_type = unicode
+
+
+def force_bytes(data, encoding="ascii"):
+    if isinstance(data, bytes):
+        return data
+
+    if isinstance(data, string_types):
+        return data.encode(encoding)
+
+    return data
+
+
+def force_text(data, encoding="utf-8"):
+    if isinstance(data, text_type):
+        return data
+
+    if isinstance(data, bytes):
+        return data.decode(encoding)
+
+    if compat.PY3:
+        return text_type(data, encoding)
+    else:
+        return text_type(data)