PEP 634: Allow keyword patterns for int, str etc. #1908
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See discussion in python-dev, e.g. https://mail.python.org/archives/list/[email protected]/message/R7ZIAAQNL2CN3K3M3DMR2IQNC6DLD7FF/ |
gvanrossum
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@brandtbucher -- What do you think? The implementation already does this, so it's just a matter of aligning the PEP with the implementation. I don't see any reason to disallow keywords for these types. |
brandtbucher
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Apr 5, 2021
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I think this is now sufficiently non-controversial that I'm just changing the PEP. Adding @brettcannon so the SC isn't caught by surprise that we're making this change. |
gvanrossum
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Apr 6, 2021
See: - python/peps#1909 (__match_args__ must be a tuple) - python/peps#1908 (allow keyword patterns for int(x) etc.)
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This resolves a discrepancy between the specification and the implementation, in favor of the current implementation. The spec used to state that you can't have patterns like these:
The implementation allows this and there is no good reason to disallow it, so it makes sense to rule that the PEP was mistaken here. (I don't recall why I put it in the PEP and in fact I was surprised to find it there.)