improve python3 support

pipeline/compilers/__init__.py

+from __future__ import unicode_literals
+
 import os
 import subprocess
 

pipeline/compilers/coffee.py

+from __future__ import unicode_literals
+
 from pipeline.conf import settings
 from pipeline.compilers import SubProcessCompiler
 

pipeline/compilers/less.py

+from __future__ import unicode_literals
+
 from os.path import dirname
 
 from pipeline.conf import settings

pipeline/compilers/sass.py

+from __future__ import unicode_literals
+
 from os.path import dirname
 
 from pipeline.conf import settings

pipeline/compilers/stylus.py

+from __future__ import unicode_literals
+
 from os.path import dirname
 
 from pipeline.conf import settings

pipeline/compressors/__init__.py

+from __future__ import unicode_literals
+
 import base64
 import os
 import posixpath
@@ -8,8 +10,6 @@ from itertools import takewhile
 
 from django.utils.encoding import smart_bytes, force_text
 
-from django.contrib.staticfiles import finders
-
 from pipeline.conf import settings
 from pipeline.storage import default_storage
 from pipeline.utils import to_class, relpath
@@ -86,8 +86,8 @@ class Compressor(object):
         base_path = self.base_path(paths)
         for path in paths:
             contents = self.read_file(path)
-            contents = re.sub("\r?\n", "\\\\n", contents)
-            contents = re.sub("'", "\\'", contents)
+            contents = re.sub(b"\r?\n", b"\\\\n", contents)
+            contents = re.sub(b"'", b"\\'", contents)
             name = self.template_name(path, base_path)
             compiled += "%s['%s'] = %s('%s');\n" % (
                 namespace,
@@ -138,7 +138,7 @@ class Compressor(object):
 
     def concatenate(self, paths):
         """Concatenate together a list of files"""
-        return '\n'.join([self.read_file(path) for path in paths])
+        return b"\n".join([self.read_file(path) for path in paths])
 
     def construct_asset_path(self, asset_path, css_path, output_filename, variant=None):
         """Return a rewritten asset URL for a stylesheet"""
@@ -203,7 +203,7 @@ class Compressor(object):
 
     def read_file(self, path):
         """Read file content in binary mode"""
-        file = default_storage.open(path, 'rb')
+        file = default_storage.open(path)
         content = file.read()
         file.close()
         return content

pipeline/compressors/closure.py

+from __future__ import unicode_literals
+
 from pipeline.conf import settings
 from pipeline.compressors import SubProcessCompressor
 

pipeline/compressors/cssmin.py

+from __future__ import unicode_literals
+
 from pipeline.conf import settings
 from pipeline.compressors import SubProcessCompressor
 

pipeline/compressors/csstidy.py

+from __future__ import unicode_literals
+
 from django.core.files import temp as tempfile
 
 from pipeline.conf import settings

pipeline/compressors/jsmin.py

-from __future__ import absolute_import
+from __future__ import absolute_import, unicode_literals
 
 from pipeline.compressors import CompressorBase
 

pipeline/compressors/slimit.py

-from __future__ import absolute_import
+from __future__ import absolute_import, unicode_literals
 
 from pipeline.compressors import CompressorBase
 

pipeline/compressors/uglifyjs.py

+from __future__ import unicode_literals
+
 from pipeline.conf import settings
 from pipeline.compressors import SubProcessCompressor
 

pipeline/compressors/yui.py

+from __future__ import unicode_literals
+
 from pipeline.conf import settings
 from pipeline.compressors import SubProcessCompressor
 

pipeline/conf/settings.py

+from __future__ import unicode_literals
+
 from django.conf import settings
 
 PIPELINE = getattr(settings, 'PIPELINE', not settings.DEBUG)

pipeline/glob.py

+from __future__ import unicode_literals
+
 import os
 import re
 import fnmatch

pipeline/jinja2/ext.py

+from __future__ import unicode_literals
+
 import inspect
 
 from django.contrib.staticfiles.storage import staticfiles_storage

pipeline/manifest.py

+from __future__ import unicode_literals
+
 import os
 
 from django.contrib.staticfiles.finders import get_finders

pipeline/middleware.py

+from __future__ import unicode_literals
+
 from django.utils.encoding import DjangoUnicodeDecodeError
 from django.utils.html import strip_spaces_between_tags as minify_html
 

pipeline/packager.py

+from __future__ import unicode_literals
+
 from django.core.files.base import ContentFile
 from django.utils.encoding import smart_str
 

pipeline/signals.py

+from __future__ import unicode_literals
+
 from django.dispatch import Signal
 
 

pipeline/storage.py

+from __future__ import unicode_literals
+
 import os
 
 from django.contrib.staticfiles import finders
-from django.contrib.staticfiles.storage import CachedFilesMixin, StaticFilesStorage
+from django.contrib.staticfiles.storage import CachedFilesMixin, StaticFilesStorage # noqa
 
 from django.core.exceptions import ImproperlyConfigured
 from django.core.files.storage import get_storage_class

pipeline/templatetags/compressed.py

-from django.contrib.staticfiles.storage import staticfiles_storage
+from __future__ import unicode_literals
+
+from django.contrib.staticfiles.storage import staticfiles_storage # noqa
 
 from django import template
 from django.template.loader import render_to_string

pipeline/utils.py

+from __future__ import unicode_literals
+
 import mimetypes
 import posixpath
 import urllib

tests/tests/test_compiler.py

+from __future__ import unicode_literals
+
 from django.test import TestCase
 
 from pipeline.conf import settings

tests/tests/test_compressor.py

 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
 import base64
 
 try:
     from mock import patch
 except:
-    from unittest.mock import patch
+    from unittest.mock import patch  # noqa
 
 from django.test import TestCase
 
@@ -37,7 +39,7 @@ class CompressorTest(TestCase):
             _('pipeline/js/first.js'),
             _('pipeline/js/second.js')
         ])
-        self.assertEquals("""function concat() {\n  console.log(arguments);\n}\n\nfunction cat() {\n  console.log("hello world");\n}\n""", js)
+        self.assertEquals(b"""function concat() {\n  console.log(arguments);\n}\n\nfunction cat() {\n  console.log("hello world");\n}\n""", js)
 
     @patch.object(base64, 'b64encode')
     def test_encoded_content(self, mock):
@@ -102,7 +104,7 @@ class CompressorTest(TestCase):
         output = self.compressor.concatenate_and_rewrite([
             _('pipeline/css/urls.css'),
         ], 'css/screen.css')
-        self.assertEquals(u"""@font-face {
+        self.assertEquals("""@font-face {
   font-family: 'Pipeline';
   src: url(../pipeline/fonts/pipeline.eot);
   src: url(../pipeline/fonts/pipeline.eot?#iefix) format('embedded-opentype');

tests/tests/test_glob.py

+from __future__ import unicode_literals
+
 import os
 import shutil
 

tests/tests/test_jinja2.py

 # -*- coding: utf-8 -*-
-from __future__ import absolute_import
+from __future__ import absolute_import, unicode_literals
 
 from django.conf import settings
 from django.test import TestCase

tests/tests/test_packager.py

+from __future__ import unicode_literals
+
 from django.test import TestCase
 
 from pipeline.packager import Packager, PackageNotFound

tests/tests/test_storage.py

+from __future__ import unicode_literals
+
 from django.test import TestCase
 from django.utils.datastructures import SortedDict
 

tests/tests/test_utils.py

 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
 from django.test import TestCase
 
 from pipeline.utils import guess_type