docs: def env_info():
      '''
      Returns a string that contains the Python version and runtime path.
      '''
      v = sys.version_info
      pyver = f'Python {v.major}.{v.minor}.{v.micro}'
      if v.releaselevel == 'alpha':
          pyver += 'a'
      if v.releaselevel == 'beta':
          pyver += 'b'
      if v.releaselevel == 'candidate':
          pyver += 'rc'
      if v.releaselevel != 'final':
          pyver += str(v.serial)
      return f'{pyver} (env: {sys.prefix})'