python / python/cpython

(str|bytes).(r)find don't take kwargs

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#150,148 2 comments 0 reactions 0 assignees View on GitHub

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interpreter-core type-feature
Dominant language
Python
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Description

Feature or enhancement

Proposal:
'test'.find('e',end=3) # this currently just gives a "TypeError: str.find() takes no keyword arguments" same for the others
b'test2\x00garbage'.rfind(b'\0',start=4)
Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by locating the implementations and tests for str.find, str.rfind, bytes.find, and bytes.rfind. Check how their start and end arguments are currently handled, then add coverage for keyword arguments matching the examples; done means those calls work without TypeError and existing behavior remains intact.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
backend
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
55/100

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