[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset e8165e79f57cb3ca60bf031c417f8fd20c99eaa2 by Łukasz Langa (Miss 
Islington (bot)) in branch '3.9':
bpo-37062: Enum: add extended AutoNumber example (GH-22349) (GH-22370)
https://github.com/python/cpython/commit/e8165e79f57cb3ca60bf031c417f8fd20c99eaa2


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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Ethan Furman]

Ethan Furman  added the comment:


New changeset 64362c2e435eddc5e84cea313d92bc0b96d227f7 by Miss Islington (bot) 
in branch '3.9':
bpo-37062: Enum: add extended AutoNumber example (GH-22349) (GH-22370)
https://github.com/python/cpython/commit/64362c2e435eddc5e84cea313d92bc0b96d227f7


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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Ethan Furman]

Ethan Furman  added the comment:

Thank you, Reuben!

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status: open -> closed

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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Ethan Furman]

Ethan Furman  added the comment:


New changeset 5acc1b5f0b62eef3258e4bc31eba3b9c659108c9 by Miss Islington (bot) 
in branch '3.8':
bpo-37062: Enum: add extended AutoNumber example (GH-22349) (GH-22369)
https://github.com/python/cpython/commit/5acc1b5f0b62eef3258e4bc31eba3b9c659108c9


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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/22370

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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[miss-islington]

Change by miss-islington :


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nosy_count: 3.0 -> 4.0
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pull_request: https://github.com/python/cpython/pull/22369

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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Ethan Furman]

Change by Ethan Furman :


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stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22349

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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Reuben Thomas]

Reuben Thomas  added the comment:

That's the one I was thinking of: the example in the docs.

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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Ethan Furman]

Ethan Furman  added the comment:

The only `AutoNumber` in the stdlib is as an example in the docs.  Were you 
thinking of something else?

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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Ethan Furman]

Change by Ethan Furman :


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versions: +Python 3.9 -Python 3.8

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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Ethan Furman]

Change by Ethan Furman :


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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Reuben Thomas]

Reuben Thomas  added the comment:

Just to be clear, the proposed change to the documentation is simply to add ", 
*args" to the argument list of AutoNumber.__new__.

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[issue37062] `AutoNumber` class in enum documentation: support *args in constructor

[Reuben Thomas]

New submission from Reuben Thomas :

By changing one line of AutoNumber:

def __new__(cls):

to

def __new__(cls, *args):

Enums derived from AutoNumber can now support constructors that take named 
arguments; for example:

class Color(AutoNumber):
def __init__(self, pantone=None):
self.pantone = pantone or 'unknown'

class Swatch(Color):
AUBURN = ('3497')
SEA_GREEN = ('1246')
BLEACHED_CORAL = () # New color, no Pantone code yet!

Without the change, one gets the error:

TypeError: __new__() takes 1 positional argument but 2 were given

I attach runnable demonstration code.

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assignee: docs@python
components: Documentation
files: foo.py
messages: 343607
nosy: docs@python, rrt
priority: normal
severity: normal
status: open
title: `AutoNumber` class in enum documentation: support *args in constructor
versions: Python 3.8
Added file: https://bugs.python.org/file48365/foo.py

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