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import inspect

import logging

import sys

import attr

logging.basicConfig(stream=sys.stderr, level=logging.INFO)

@attr.s

class C:

a = attr.ib(default=42)

b = attr.ib(default=attr.Factory(list))

c = attr.ib(factory=list)

d = attr.ib()

@d.default

def _any_name_except_a_name_of_an_attribute(self):

return {}

@attr.s

class CWithBadDefault:

x = attr.ib(default=[])

if __name__ == "__main__":

c = C()

logging.info("%s", c)

bad_one = CWithBadDefault()

bad_two = CWithBadDefault()

bad_one.x.append(87)

logging.info("%s", bad_two.x)