class_docstr: This class provides a set of methods to read, parse and answer
  questions about a single robots.txt file.
code: def site_maps(self):
      if not self.sitemaps:
          return None
      return self.sitemaps
  
imports: import collections
  import urllib.parse
  import urllib.request
label_desc: Use image node_id 11 for calling the RobotFileParser obj's underlying member method code with example usage: obj.site_maps() and returns: self, None