code: def _get_env_bin_path(env_path):
      
      if IS_VIRTUALENV_INSTALLED:
          path = virtualenv.path_locations(env_path)[3]
      else:
          path = os.path.join(env_path, 'Scripts' if IS_WIN else 'bin')
      return r'{0}'.format(path)
docs: Return the bin path for a virtualenv
  
      This provides a fallback for a situation in which you're trying
      to use the script and create a virtualenv from within
      a virtualenv in which virtualenv isn't installed and so
      is not importable.