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gh-133986: Document string split algorithm when sep is None and maxsplit is 0 #133987
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                    donBarbos
  
              
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                    May 14, 2025 
                  
              
              
            
            
Co-authored-by: Semyon Moroz <[email protected]>
    
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… maxsplit is 0 (pythonGH-133987) * Document string split algorithm when sep is None and maxsplit is 0 * Update Doc/library/stdtypes.rst Co-authored-by: Semyon Moroz <[email protected]> --------- (cherry picked from commit 3e23047) Co-authored-by: Joey Smith <[email protected]> Co-authored-by: Ned Batchelder <[email protected]> Co-authored-by: Semyon Moroz <[email protected]>
    
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… maxsplit is 0 (pythonGH-133987) * Document string split algorithm when sep is None and maxsplit is 0 * Update Doc/library/stdtypes.rst Co-authored-by: Semyon Moroz <[email protected]> --------- (cherry picked from commit 3e23047) Co-authored-by: Joey Smith <[email protected]> Co-authored-by: Ned Batchelder <[email protected]> Co-authored-by: Semyon Moroz <[email protected]>
| GH-133992 is a backport of this pull request to the 3.13 branch. | 
| GH-133993 is a backport of this pull request to the 3.14 branch. | 
| I'm a bit late I suppose, but I don't think this is specific to  >>> "   foo   bar   ".split(maxsplit=1)
['foo', 'bar   '] | 
    
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…d maxsplit is 0 (GH-133987) (#133993) --------- (cherry picked from commit 3e23047) Co-authored-by: Joey Smith <[email protected]> Co-authored-by: Ned Batchelder <[email protected]> Co-authored-by: Semyon Moroz <[email protected]>
    
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…d maxsplit is 0 (GH-133987) (#133992) gh-133986: Document string split algorithm when sep is None and maxsplit is 0 (GH-133987) --------- (cherry picked from commit 3e23047) Co-authored-by: Joey Smith <[email protected]> Co-authored-by: Ned Batchelder <[email protected]> Co-authored-by: Semyon Moroz <[email protected]>
    
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… maxsplit is 0 (python#133987) * Document string split algorithm when sep is None and maxsplit is 0 * Update Doc/library/stdtypes.rst Co-authored-by: Semyon Moroz <[email protected]> --------- Co-authored-by: Ned Batchelder <[email protected]> Co-authored-by: Semyon Moroz <[email protected]>
    
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… maxsplit is 0 (python#133987) * Document string split algorithm when sep is None and maxsplit is 0 * Update Doc/library/stdtypes.rst Co-authored-by: Semyon Moroz <[email protected]> --------- Co-authored-by: Ned Batchelder <[email protected]> Co-authored-by: Semyon Moroz <[email protected]>
  
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If sep is not specified or is None and maxsplit is 0, only leading runs of consecutive whitespace are considered. This is contrary to (or, at least, underspecified in) the current documentation.
I have documented the observed behaviour, and added some example code.
📚 Documentation preview 📚: https://cpython-previews--133987.org.readthedocs.build/