8000 Type `_order_` field in `Enum` · Issue #11715 · python/mypy · GitHub
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Type _order_ field in Enum #11715

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sobolevn opened this issue Dec 11, 2021 · 1 comment
Open

Type _order_ field in Enum #11715

sobolevn opened this issue Dec 11, 2021 · 1 comment
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feature topic-enum

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@sobolevn
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sobolevn commented Dec 11, 2021 •
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Right now this code passes type checking:

from enum import Enum

class E(Enum):
    _order_ = 'X Y Z'  # Should be 'X Y'
    X = 1
    Y = 2

But, in runtime it fails:

» python out/ex.py       
Traceback (most recent call last):
  File "/Users/sobolev/Desktop/mypy/out/ex.py", line 3, in <module>
    class E(Enum):
  File "/Users/sobolev/.pyenv/versions/3.10.0/lib/python3.10/enum.py", line 348, in __new__
    raise TypeError('member order does not match _order_')
TypeError: member order does not match _order_

We need to check that _order_ field is valid.
This can be a great addition to my "better Enums" series of PRs.
@sobolevn
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To fix this I need changes from #11249 to be merged.

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