Mark Shannon <[email protected]> added the comment:
Just to clarify.
class AlwaysShared:
opt = DEFAULT
def __init__(self, attr, optional=None):
self.attr = attr
if optional:
self.opt = optional
class SometimesShared:
opt = DEFAULT
def __init__(self, attr, optional=None):
if optional:
self.opt = optional
self.attr = attr
The class AlwaysShared always has shared keys, whereas the class
SometimesShared is not shared if `optional` is True for first instantiation,
but False for a later instantiation.
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<https://bugs.python.org/issue40116>
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