Python3 compatibility.

setup.py

@@ -12,7 +12,7 @@ license = 'MIT License'
 keywords = ['bioinformatics']
 
 dependencies = ['biopython', 'future', 'python-Levenshtein']
-develop_dependencies = ['pytest', 'tox']
+develop_dependencies = ['fake-open', 'pytest', 'tox']
 supported = [(2, 7), (3, 3), (3, 4)]
 classifiers = [
     'Development Status :: 3 - Alpha',

tests/test_cli.py

@@ -10,11 +10,9 @@ import sys
 from hashlib import md5
 from io import StringIO
 
-from backtranslate import cli
-
+from fake_open import md5_check
 
-def md5_check(data, md5sum):
-    return md5(data).hexdigest() == md5sum
+from backtranslate import cli
 
 
 class TestParser(object):