[issue34543] _struct.Struct: calling functions without calling __init__ results in SystemError

[DeKrain]

DeKrain <dawidkrainski8 at gmail.com> added the comment:

Well, sometimes when i do
>>> b = bytearray()
>>> s.pack_into(b)

application crashes (because it checks arg #1, which is not initialized).
Also, I imported from _struct, because it's where implementation of Struct really is.

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<https://bugs.python.org/issue34543>
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