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$ cat evil_decorator.py
#!/usr/bin/python
# -*- coding: utf-8 -*-

import logging
import functools


logging.basicConfig(level=logging.INFO)
log = logging.getLogger(__name__)


def evil_decorator(func):
    print('evil code')
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        return func(*args, **kwargs)
    return wrapper


@evil_decorator
def say_hello(name):
    print("hello {}".format(name))
    return name


if __name__ == '__main__':
    pass

Python 3.6.0

$ python evil_decorator.py
evil code

$ python2.7 evil_decorator.py
evil code