def __delitem__(self, key):
        try:
            return super(CaseInsensitiveDict, self).__delitem__(key.lower())
        except __HOLE__:
            return super(CaseInsensitiveDict, self).__delitem__(key)
dataset/ETHPy150Open missionpinball/mpf/mpf/system/config.py/CaseInsensitiveDict.__delitem__