InpUT a StRINg, reTUrN a stRINg with rANDoM upPer or lOWER caSE.

case_scram.py

def case_scram(str_):
    """ inpUT a StRINg, reTUrN a stRINg with rANDoM upPer or lOWER caSE. 
            This was built for testing case-insensitivity.
    """
    from random import choice

    if not isinstance(str_, str):
        return str_
    return "".join(choice((c.upper(), c.lower())) for c in str_)