import os
import sys
PY3=sys.version_info.major >= 3
try:
string_types = (str, unicode) # Python 2
except NameError:
string_types = (str) # Python 3
try:
from subprocess import DEVNULL # Python 3
except ImportError:
DEVNULL = open(os.devnull, 'wb') # Python 2
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