code: def find_version():
      
      version_file = read_file('__init__.py')
      version_match = re.search(r'^__version__ = ["\']([^"\']*)["\']',
                                version_file, re.M)
      if version_match:
          return version_match.group(1)
      raise RuntimeError('Unable to find version string.')
docs: Only define version in one place