[Bug 2056361] Re: [SRU] python3-qrencode fails with SystemError about PY_SSIZE_T_CLEAN macro

[Dave Jones]

Patch looks good, and the test case is well written; sponsoring

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https://bugs.launchpad.net/bugs/2056361

Title:
  [SRU] python3-qrencode fails with SystemError about PY_SSIZE_T_CLEAN
  macro

Status in python-qrencode package in Ubuntu:
  Fix Released
Status in python-qrencode source package in Jammy:
  Confirmed
Status in python-qrencode package in Debian:
  Fix Released

Bug description:
  [ Impact ]

  python3-qrencode is completely unusable as it will crash with the
  following error whenever any user tries to use to generate a QR code:

    File "/usr/lib/python3/dist-packages/qrencode/__init__.py", line 47, in encode
      version, size, data = _encode(data, version, level, hint, True)
  SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats

  
  [ Test Plan ]

  Add the following content in a python file:

  
  import qrencode

  (version, size, im) = qrencode.encode("This is working")

  im.show()

  execute the python script. With the fixed package it will display the
  QR code.

  [ Where problems could occur ]

  It is only defining 'PY_SSIZE_T_CLEAN' before including Python.h as is
  suggested by upstream Python docs. There might be some adverse affect
  for this but the package is already unusable.

  [ Other Info ]

  The same fix from Debian is in Mantic.
  Noble is also affected but I can not mark the bug status as confirmed. The NMU fix was lost with the update to 1.2-6. But I have now done a QA upload in Debian with the fix and also added an autopkgtest which has the same python script as the test plan. So, when 1.2-7 syncs, Noble will be fixed.

  [ Original Bug Description ]

  Python3 module qrencode does not allow generating QR codes using
  function encode().

  The attached very simple script dies as follows:

  $ ./python3-qrencode.py
  Traceback (most recent call last):
    File "/home/arrigo/temp/./python3-qrencode.py", line 5, in <module>
      qrencode.encode("Hello world")
    File "/usr/lib/python3/dist-packages/qrencode/__init__.py", line 47, in encode
      version, size, data = _encode(data, version, level, hint, True)
  SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats

  Package: python3-qrencode version 1.2-5build6, architecture amd64 on
  Ubuntu 22.04

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