[ARROW-10283] [Python] Python deprecation warning for "PY_SSIZE_T_CLEAN will be required for '#' formats"

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/26276
• Assignee: Joris Van den Bossche
• Reporter: Joris Van den Bossche
• Created: 12/Oct/20 12:34
• Updated: 11/Jan/23 08:12
• Resolved: 12/Jan/21 17:46

Description

We have a few cases that run into this python deprecation warning:

pyarrow/tests/test_pandas.py: 9 warnings
pyarrow/tests/test_parquet.py: 7790 warnings
  sys:1: DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats
pyarrow/tests/test_pandas.py::TestConvertDecimalTypes::test_decimal_with_None_explicit_type
pyarrow/tests/test_pandas.py::TestConvertDecimalTypes::test_decimal_with_None_infer_type
  /buildbot/AMD64_Conda_Python_3_8/python/pyarrow/tests/test_pandas.py:114: DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats
    result = pd.Series(arr.to_pandas(), name=s.name)
pyarrow/tests/test_pandas.py::TestConvertDecimalTypes::test_strided_objects
  /buildbot/AMD64_Conda_Python_3_8/python/pyarrow/pandas_compat.py:1127: DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats
    result = pa.lib.table_to_blocks(options, block_table, categories,

Related to https://bugs.python.org/issue36381

I think one such usage example is at https://github.com/apache/arrow/blob/0b481523b7502a984788d93b822a335894ffe648/cpp/src/arrow/python/decimal.cc#L106

Issue Links

• links to: GitHub Pull Request #9166