code: def page_linked_by(self, page):
      for from_page, to_pages in self.graph.items():
          for to_page in to_pages:
              if to_page == page:
                  yield from_page, to_page
  
imports: import pprint
  from collections import OrderedDict, namedtuple
  import six
  import numpy
  import scipy.sparse
  from six.moves.urllib.parse import urlparse
  from pagerank import pagerank
label_desc: Use image node_id 6 for calling the WebPageGraph obj's underlying member method code with example usage: obj.page_linked_by(page) without return types