IronLanguages / IronLanguages/ironpython3
upper/lower/capitalize do not use the default case algorithm
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Description
See https://docs.python.org/3/library/stdtypes.html#str.upper
The uppercasing algorithm used is described in section 3.13 of the Unicode Standard.
This leads to the following failure in string_tests.py:
assert '\u1ff3\u1ff3\u1ffc\u1ffc'.capitalize() == '\u03a9\u0399\u1ff3\u1ff3\u1ff3'
(Note that capitalize changed with Python 3.8 so this assertion is only valid for previous versions).
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First steps
- Read the whole issue, then the project's contributing guide.
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- Fork the repository and make your change on a branch.
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Research direction
Start with the failing assertion in string_tests.py and compare it with the linked Python str.upper documentation and Unicode casing rules. Locate the IronPython implementation of upper, lower, and capitalize, then verify the reported case and the Python 3.8 capitalize caveat against the relevant tests.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, python
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100