docs: def convert_to_pypi_version(version):
      """
      Convert a git tag version string into something compatible with `PEP-440 <https://www.python.org/dev/peps/pep-0440/>`_.
  
      :param version: The input version string, normally directly out of git describe.
      :return: PEP-440 version string
  
      Usage::
  
        >>> convert_to_pypi_version('r1.0.1')  # Normal Releases
        1.0.1
        >>> convert_to_pypi_version('r1.0.1-dev1')  # Dev Releases
        1.0.1.dev1
        >>> convert_to_pypi_version('r1.0.1-a1')  # Alpha Releases
        1.0.1a1
        >>> convert_to_pypi_version('r1.0.1-b4')  # Beta Releases
        1.0.1b4
        >>> convert_to_pypi_version('r1.0.1-rc2')  # RC Releases
        1.0.1rc2
        >>> convert_to_pypi_version('r1.0.1-12-geaea7b6')  # Post Releases
        1.0.1.post12
      """
      v = re.search('^[r,v]{0,1}(?P<final>[0-9\.]+)(\-(?P<pre>(a|b|rc)[0-9]+))?(\-(?P<dev>dev[0-9]+))?(\-(?P<post>[0-9]+))?(\-.+)?$', version)
      if not v:
          return __default_version__
  
      # https://www.python.org/dev/peps/pep-0440/#final-releases
      version = v.group('final')
  
      # https://www.python.org/dev/peps/pep-0440/#pre-releases
      if v.group('pre'):
          version += v.group('pre')
  
      # https://www.python.org/dev/peps/pep-0440/#developmental-releases
      if v.group('dev'):
          version += '.%s' % v.group('dev')
  
      # https://www.python.org/dev/peps/pep-0440/#post-releases
      if v.group('post'):
          version += '.post%s' % v.group('post')
  
      return version