8000 Support default values for collections.namedtuple? · Issue #4788 · python/mypy · GitHub
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ilevkivskyi opened this issue Mar 24, 2018 · 3 comments
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Support default values for collections.namedtuple? #4788

ilevkivskyi opened this issue Mar 24, 2018 · 3 comments
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@JelleZijlstra
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@ilevkivskyi
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Python 3.7 adds support for specifying default values in call to collections.namedtuple, see python/cpython#4859. So for example this is valid:

from collections import namedtuple

NT = namedtuple('NT', ('x', 'y'), defaults=(0, 0))
NT()
NT(1)
NT(1, 2)

Should we support this, or supporting default values for typing.NamedTuple (already implemented) is enough?
@gvanrossum
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The short form of collections.namedtuple is very popular (ask @rhettinger) and I think we should make it as easy as possible to translate its use to typing.NamedTuple. So I think we should support it.

@JukkaL
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JukkaL commented Mar 26, 2018

I agree with @gvanrossum. Also, this doesn't look like a lot of work to implement. Tagging as high priority since 3.7 release date is pretty close.

@emmatyping emmatyping mentioned this issue Apr 12, 2018
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This was referenced Jun 14, 2018
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@JelleZijlstra JelleZijlstra self-assigned this Jun 14, 2018
@JelleZijlstra
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Fixed by #5215.

@njgheorghita njgheorghita mentioned this issue Nov 18, 2019
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