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from distutils.log import warn
if hasattr(__builtins__, 'print'):
    printf = print
else:
    printf = warn

The problem with the above code is that the if condition is True even for Python2. To fix it, we must import sys and change that line to: if sys.version_info[0] == 3:

Further, we can add an elif statement to see whether this is part of the main script to be executed, or if it is imported to some other script, just like we did in ushuffle_dbU.py.