Cournapeau David <da...@ar.media.kyoto-u.ac.jp> added the comment: I disagree the feature is not needed, for several reasons: - complex(repr(..)) roundtrip should work, whatever the value of complex is - it is supported for float, so why not for complex ? - I believe on the contrary it solves a very real problem: incidently, I got interested in this patch while working on numpy, and it is certainly useful to be able to parse nan and inf (for example when we create arrays from strings). Nan may be seen as non useful for so called real usage of python, but for scientific people, it is a crucial to have proper support of nan (which may mean missing data depending on the context) and inf. - it does not add complexity: I would argue that independantly of nan/inf support, my patch makes the function simpler to follow (no state machine with done/sw_error/etc... state).
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