[issue2561] Instance remembers old values from former life

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Yes, this is expected. Default values are only evaluated once, at
function creation time. If you need to have a mutable default argument
that is assigned to something and changed, use something like this:

def f(arg=None):
    if arg is None:
        arg = []
    ...

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nosy: +georg.brandl
resolution:  -> wont fix
status: open -> closed

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