Drop six

Dockerfile

 FROM alpine:edge
 
 RUN echo http://dl-cdn.alpinelinux.org/alpine/edge/testing >> /etc/apk/repositories && \
-    apk add --no-cache uwsgi-python3 git ctags  py3-six py3-markupsafe py3-pygments \
+    apk add --no-cache uwsgi-python3 git ctags  py3-markupsafe py3-pygments \
                        py3-dulwich py3-humanize py3-flask py3-flask-markdown py3-docutils
 
 RUN apk add --no-cache python3-dev py3-pip gcc musl-dev && \

klaus/highlighting.py

-from six.moves import filter
+try:
+    # Python < 3
+    from itertools import ifilter as filter
+except ImportError:
+    pass
 
 from pygments import highlight
 from pygments.lexers import (

klaus/utils.py

@@ -8,7 +8,6 @@ import mimetypes
 import locale
 import warnings
 import subprocess
-import six
 
 try:
     import chardet
@@ -136,7 +135,12 @@ def decode_from_git(b):
 def force_unicode(s):
     """Do all kinds of magic to turn `s` into unicode"""
     # It's already unicode, don't do anything:
-    if isinstance(s, six.text_type):
+    try:
+        # Python < 3
+        text_type = unicode
+    except NameError:
+        text_type = str
+    if isinstance(s, text_type):
         return s
 
     last_exc = None

setup.py

@@ -16,7 +16,6 @@ def install_data_files_hack():
 install_data_files_hack()
 
 requires = [
-    "six",
     "flask",
     "Werkzeug>=0.15.0",
     "pygments",