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URL: https://github.com/python/cpython/issues/107715

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DocTestFinder.find fails if module contains class objects with special characters #107715

@gertjanvanzwieten

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@gertjanvanzwieten

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  • I am confident this is a bug in CPython, not a bug in a third-party project
  • I have searched the CPython issue tracker, and am confident this bug has not been reported before

A clear and concise description of the bug

Doctests initialization may fail with re.error in case a module contains (dynamically generated) class objects with special characters in their name. This is caused by the regular expression compiled in doctest.DocTestFinder._find_lineno failing to escape the class name before embedding it. If compilation does succeed, then invalid matches may result from interpreting the class name as a search pattern.

Your environment

  • CPython versions tested on: 3.9.2
  • Operating system and architecture: Debian linux amd64

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