code: def relativefrom(base, path):
      # type: (Text, Text) -> Text
      
      base_parts = list(iteratepath(base))
      path_parts = list(iteratepath(path))
  
      common = 0
      for component_a, component_b in zip(base_parts, path_parts):
          if component_a != component_b:
              break
          common += 1
  
      return "/".join([".."] * (len(base_parts) - common) + path_parts[common:])
docs: Return a path relative from a given base path.
  
      Insert backrefs as appropriate to reach the path from the base.
  
      Arguments:
          base (str): Path to a directory.
          path (str): Path to make relative.
  
      Returns:
          str: the path to ``base`` from ``path``.
  
      >>> relativefrom("foo/bar", "baz/index.html")
      '../../baz/index.html'