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GH-70647: Deprecate strptime day of month parsing without a year present to avoid leap-year bugs by gpshead · Pull Request #117107 · python/cpython · GitHub
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GH-70647: Deprecate strptime day of month parsing without a year present to avoid leap-year bugs #117107

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Merged
encukou merged 9 commits into from
Apr 3, 2024
Merged

GH-70647: Deprecate strptime day of month parsing without a year present to avoid leap-year bugs #117107

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4b929e4
Deprecate strptime leap-year ambiguous MM-DD parsing.
gpshead Mar 20, 2024
b0eacf9
Fix the stacklevel and remove example from the warning message.
gpshead Mar 20, 2024
5851b0b
Simplify _assertNotWarns error message, removing a typo.
gpshead Mar 20, 2024
a068dac
add a unittest for _assertNotWarns.
gpshead Mar 20, 2024
333ba57
Document the behavior deprecation.
gpshead Mar 29, 2024
b12e7e5
minor doc cleanup.
gpshead Apr 1, 2024
d4c994e
adjust example code comments.
gpshead Apr 1, 2024
92e30b8
Fix doctest
encukou Apr 2, 2024
f1bd314
Use skip_file_prefixes for the warning
encukou Apr 3, 2024
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adjust example code comments. 
To passively encourage people to include such comments in their own code
when adopting this mitigation...
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@gpshead
gpshead committed Apr 1, 2024
commit d4c994eb1a378198b540cb7688cf6d46cc0c2b4f
4 changes: 2 additions & 2 deletions Doc/library/datetime.rst
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Expand Up @@ -1094,7 +1094,7 @@ Other constructors, all class methods:

>>> from datetime import datetime
>>> date_string = "02/29"
>>> when = datetime.strptime(f"{date_string};1984", "%m/%d;%Y")
>>> when = datetime.strptime(f"{date_string};1984", "%m/%d;%Y") # Avoids leap year bug.
>>> when.strftime("%B %d") # doctest: +SKIP
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pganssle marked this conversation as resolved.
'February 29'

Expand Down Expand Up @@ -2682,7 +2682,7 @@ Notes:
exception when it encounters leap day because the default year used by the
parser is not a leap year. Users run into this bug every four years...

>>> strptime(f"{month_day};1984", "%m/%d;%Y") # problem mitigated!
>>> strptime(f"{month_day};1984", "%m/%d;%Y") # No leap year bug.
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encukou marked this conversation as resolved.
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.. deprecated-removed:: 3.13 3.15
:meth:`~.datetime.strptime` calls using a format string containing
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