[issue40430] ast.Slice is no longer a subclass of ast.slice

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Even if make ast.Slice a (virtual) subclass of ast.slice it will not help much, 
because we cannot do it for ast.Index and ast.ExtSlice. ast.ExtSlice is not 
replaced with ast.Tuple, and any node type can now be used instead of 
ast.Index. The code that does isinstance() or issublass() check for ast.slice 
or one of its subcasses is now broken.

--
resolution:  -> wont fix
stage:  -> resolved
status: open -> closed

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[issue40430] ast.Slice is no longer a subclass of ast.slice

[Irit Katriel]

Irit Katriel  added the comment:

Looks like the answer is: it is a deliberate change, not a bug. Should this 
issue be closed?

--
components: +Library (Lib)
nosy: +iritkatriel

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[issue40430] ast.Slice is no longer a subclass of ast.slice

[Batuhan Taskaya]

Batuhan Taskaya  added the comment:

This has been discussee and rejected (for certain reasonsons): 
https://github.com/python/cpython/pull/19056#discussion_r396087689

--
nosy: +BTaskaya, serhiy.storchaka

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[issue40430] ast.Slice is no longer a subclass of ast.slice

[Anthony Sottile]

New submission from Anthony Sottile :

unclear if this is intentional or not, I noticed this while seeing that 
`ast.Subscript.slice` is no longer `Index` / `Slice` / `ExtSlice`

# python3.8

>>> isinstance(ast.Slice(), ast.slice)
True

# python3.9a6

>>> isinstance(ast.Slice(), ast.slice)
False

--
messages: 367571
nosy: Anthony Sottile
priority: normal
severity: normal
status: open
title: ast.Slice is no longer a subclass of ast.slice
type: behavior
versions: Python 3.9

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