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gh-89157: Make C and Python implementation of datetime.date.fromisoformat consistent. #131007

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Merged
merged 7 commits into from
Apr 24, 2025
Merged

gh-89157: Make C and Python implementation of datetime.date.fromisoformat consistent. #131007

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09958cc
Initial
StanFromIreland Mar 9, 2025
37140a9
Update test
StanFromIreland Mar 9, 2025
2cf9d18
Clean up test
StanFromIreland Mar 9, 2025
1a6d229
Fix test
StanFromIreland Mar 9, 2025
644ab29
Fix tests
StanFromIreland Mar 9, 2025
d742472
Fix tests
StanFromIreland Mar 9, 2025
9ff8a9e
NEWS fix
StanFromIreland Mar 9, 2025
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6 changes: 5 additions & 1 deletion Lib/_pydatetime.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1051,8 +1051,12 @@ def fromordinal(cls, n):
@classmethod
def fromisoformat(cls, date_string):
"""Construct a date from a string in ISO 8601 format."""

if not isinstance(date_string, str):
raise TypeError('fromisoformat: argument must be str')
raise TypeError('Argument must be a str')

if not date_string.isascii():
raise ValueError('Argument must be an ASCII str')

if len(date_string) not in (7, 8, 10):
raise ValueError(f'Invalid isoformat string: {date_string!r}')
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3 changes: 2 additions & 1 deletion Lib/test/datetimetester.py
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Expand Up @@ -2083,6 +2083,7 @@ def test_fromisoformat_fails(self):
'10000-W25-1', # Invalid year
'2020-W25-0', # Invalid day-of-week
'2020-W25-8', # Invalid day-of-week
'٢025-03-09' # Unicode characters
'2009\ud80002\ud80028', # Separators are surrogate codepoints
]

Expand Down Expand Up @@ -3534,7 +3535,7 @@ def test_fromisoformat_fails_datetime(self):
'2009-04-19T03:15:4500:00', # Bad time zone separator
'2009-04-19T03:15:45.123456+24:30', # Invalid time zone offset
'2009-04-19T03:15:45.123456-24:30', # Invalid negative offset
'2009-04-10ᛇᛇᛇᛇᛇ12:15', # Too many unicode separators
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Why was this changed? The problem isn't that there are Unicode characters but that there is more than one of them. The old description was now accurate.

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It is a bit late now, it probably should have been asked a month ago when you approved this. In hindsight I agree the previous one was better.

'2009-04-10ᛇᛇᛇᛇᛇ12:15', # Unicode chars
'2009-04\ud80010T12:15', # Surrogate char in date
'2009-04-10T12\ud80015', # Surrogate char in time
'2009-04-19T1', # Incomplete hours
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-03-09-10-37-00.gh-issue-89157.qg3r138.rst
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@@ -0,0 +1,2 @@
Make the pure Python implementation of :func:`datetime.date.fromisoformat`,
only accept ASCII strings for consistency with the C implementation.
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