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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_relative_path(self):
 """Returns the path with the query parameters escaped and appended."""

    param_string = self._get_query_string()
    if self.path is None:
      path = '/'
    else:
      path = self.path
    if param_string:
      return '?'.join([path, param_string])
    else:
      return path