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Showing content from https://mail.python.org/pipermail/python-dev/2012-October/122256.html below:

[Python-Dev] return type of __complex__

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Am 19.10.2012 18:23, schrieb Maciej Fijalkowski:
> Nick just said it's a bug that cmath type checks are too strict.

I'm not so sure about that. cmath just uses PyArg_ParseTuple with "D"
which itself relies upon PyComplex_AsCComplex().

D (complex) [Py_complex]
    Convert a Python complex number to a C Py_complex structure.

In order to fix the bug the code in PyComplex_AsCComplex() must be
altered to support float as return type from __complex__(). That's a
major change.

Christian

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