02_parse_discussions.py: TypeError: 'dictionary-keyiterator' object has no attribute '__getitem__'

[tlu1717]

Hello, I am trying to use your repo in parsing wiki talk data. When running the 02_parse_discussion.py, I keep getting
TypeError: 'dictionary-keyiterator' object has no attribute '__getitem__'

The full error is:

Retrieving list of files in directory: ../talk_pages/
directory: ../talk_pages/ has 13 objects (file or directories)
Traceback (most recent call last):
  File "02_parse_discussions.py", line 762, in <module>
    main()
  File "02_parse_discussions.py", line 218, in main
    parse(id, pageFile)
  File "02_parse_discussions.py", line 473, in parse
    addNode(level, user, date, text)
  File "02_parse_discussions.py", line 704, in addNode
    predecessorNode = g.predecessors(predecessorNode)[0]
TypeError: 'dictionary-keyiterator' object has no attribute '__getitem__'

Can anyone please help me with this? Thank you.