Description

wimglenn

opened on Aug 8, 2023

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Documentation

https://docs.python.org/3/library/functions.html#slice currently shows:

class slice(start, stop, step=1)

This was changed from slice(start, stop[, step]) in #96579. That default for step is incorrect. It's correct in a range, but in a slice it actually defaults to None:

>>> slice(1,2).step is None
True

Most code handle step=1 and step=None the same way when receiving a slice, but user defined types implementing __getitem__/__setitem__/__delitem__ aren't obliged to, and the correct default should be documented.

Linked PRs

• gh-107755: Document the correct default value of slice step #107756
• [3.12] gh-107755: Document the correct default value of slice step (GH-107756) #108955
• [3.11] gh-107755: Document the correct default value of slice step (GH-107756) #108956

Activity

1. wimglenn

   added

   docsDocumentation in the Doc dirDocumentation in the Doc dir

   on Aug 8, 2023
2. wimglenn

   added a commit that references this issue on Aug 8, 2023

   Document the correct default value of slice step. Closes python#107755

   d0d5d0a
3. rhettinger

   self-assigned this

   on Aug 13, 2023
4. wimglenn

   added a commit that references this issue on Aug 15, 2023

   Document the correct default value of slice step. Closes python#107755

   c9098a1
5. encukou

   added a commit that references this issue on Sep 5, 2023

   gh-107755: Document the correct default value of slice step (GH-107756)

   9bf350b
6. miss-islington

   added 2 commits that reference this issue on Sep 5, 2023

   pythongh-107755: Document the correct default value of slice step (py…

   c056ba4

   pythongh-107755: Document the correct default value of slice step (py…

   b36cb9e
7. vstinner

   added a commit that references this issue on Sep 7, 2023

   [3.11] gh-107755: Document the correct default value of slice step (G…

   1f115a8
8. Yhg1s

   added a commit that references this issue on Sep 8, 2023

   [3.12] gh-107755: Document the correct default value of slice step (G…

   eeaae92
9. wimglenn

   closed this as completedon Oct 4, 2023

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