Opened 3 months ago

Closed 3 months ago

Last modified 2 months ago

#35630 closed Bug (duplicate)

`django.utils.formats.sanitize_strftime_format()` no longer works correctly with Python 3.13.0b4

Reported by: Michał Górny Owned by:
Component: Utilities Version: dev
Severity: Normal Keywords:
Cc: Michał Górny Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

Python 3.13.0b4 includes a change to ​add zero-padding to `%y` and `%Y` `strftime()` formats. However, padding is not added to %C or %F formats.

The current logic in django assumes that if %Y is padded, then no padding needs to be added:

    if datetime.date(1, 1, 1).strftime("%Y") == "0001":
        return fmt

​https://github.com/django/django/blob/0e94f292cda632153f2b3d9a9037eb0141ae9c2e/django/utils/formats.py#L266

This misfires on 3.13.0b4, stopping django from adding the padding to %C and %F formats.

I've filed ​a bug to CPython upstream about this inconsistent behavior.

This is causing the following test failures:

======================================================================
FAIL: test_sanitize_strftime_format (i18n.tests.FormattingTests.test_sanitize_strftime_format) (year=1, fmt='%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1195, in test_sanitize_strftime_format
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '0' != '00'
- 0
+ 00
? +


======================================================================
FAIL: test_sanitize_strftime_format (i18n.tests.FormattingTests.test_sanitize_strftime_format) (year=1, fmt='%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1195, in test_sanitize_strftime_format
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '1-01-01' != '0001-01-01'
- 1-01-01
+ 0001-01-01
? +++


======================================================================
FAIL: test_sanitize_strftime_format (i18n.tests.FormattingTests.test_sanitize_strftime_format) (year=99, fmt='%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1195, in test_sanitize_strftime_format
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '0' != '00'
- 0
+ 00
? +


======================================================================
FAIL: test_sanitize_strftime_format (i18n.tests.FormattingTests.test_sanitize_strftime_format) (year=99, fmt='%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1195, in test_sanitize_strftime_format
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '99-01-01' != '0099-01-01'
- 99-01-01
+ 0099-01-01
? ++


======================================================================
FAIL: test_sanitize_strftime_format (i18n.tests.FormattingTests.test_sanitize_strftime_format) (year=999, fmt='%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1195, in test_sanitize_strftime_format
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '9' != '09'
- 9
+ 09
? +


======================================================================
FAIL: test_sanitize_strftime_format (i18n.tests.FormattingTests.test_sanitize_strftime_format) (year=999, fmt='%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1195, in test_sanitize_strftime_format
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '999-01-01' != '0999-01-01'
- 999-01-01
+ 0999-01-01
? +


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=1, fmt='%%%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%0' != '%00'
- %0
+ %00
?   +


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=1, fmt='%%%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%1-01-01' != '%0001-01-01'
- %1-01-01
+ %0001-01-01
?  +++


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=1, fmt='%%%%%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%%0' != '%%00'
- %%0
+ %%00
?    +


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=1, fmt='%%%%%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%%1-01-01' != '%%0001-01-01'
- %%1-01-01
+ %%0001-01-01
?   +++


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=99, fmt='%%%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%0' != '%00'
- %0
+ %00
?   +


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=99, fmt='%%%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%99-01-01' != '%0099-01-01'
- %99-01-01
+ %0099-01-01
?  ++


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=99, fmt='%%%%%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%%0' != '%%00'
- %%0
+ %%00
?    +


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=99, fmt='%%%%%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%%99-01-01' != '%%0099-01-01'
- %%99-01-01
+ %%0099-01-01
?   ++


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=999, fmt='%%%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%9' != '%09'
- %9
+ %09
?  +


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=999, fmt='%%%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%999-01-01' != '%0999-01-01'
- %999-01-01
+ %0999-01-01
?  +


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=999, fmt='%%%%%C')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%%9' != '%%09'
- %%9
+ %%09
?   +


======================================================================
FAIL: test_sanitize_strftime_format_with_escaped_percent (i18n.tests.FormattingTests.test_sanitize_strftime_format_with_escaped_percent) (year=999, fmt='%%%%%F')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/django/tests/i18n/tests.py", line 1227, in test_sanitize_strftime_format_with_escaped_percent
    self.assertEqual(dt.strftime(fmt), expected)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '%%999-01-01' != '%%0999-01-01'
- %%999-01-01
+ %%0999-01-01
?   +

Change History (2)

comment:1 by Sarah Boyce, 3 months ago

Resolution: → duplicate
Status: new → closed

Thank you for drawing this to our attention Michal
I'm going to link this up to #34900 which tracks adding Python 3.13 support 👍

comment:2 by Natalia Bidart, 2 months ago

This was nicely reverted and fixed in Python: ​https://github.com/python/cpython/pull/122436/

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