AttributeError: 'NoneType' object has no attribute 'traverse_tree'

[colejensen]

I'm trying to use the ".traverse_tree" option on an imported .json file. When I use traverse_tree, I get an error saying, "AttributeError: 'NoneType' object has no attribute 'traverse_tree'."

A colleague of mine doesn't get this error using the same code, but they use version 0.1.0. I have gotten it with version 0.1.1 and 0.1.2. When I tried to revert to version 0.1.0, I get the following error: "FileNotFoundError: [Errno 2] No such file or directory: 'requirements.txt'".

You can see a copy of the code I'm running here.

[evogytis]

Hi Cole,

I believe this will be caused by the fact that .subtree() will return None if the conditional traversal doesn't encounter any tips. This can happen if you initiate a traversal on a node in state B but all of the node's children are in another state and since there's no tips in the conditional subtree there's no subtree to be extracted. I think I had the code set up correctly for Ebola exploded trees but didn't bother for flu B because I knew all the traversals would be fine. You can test if this is the case by traversing the subtree with the same condition (should be ll.traverse_tree(k, traverse_condition=traverse_condition, reset_branches=False)) and seeing if any tips are returned.

Thanks for spotting this!

Best,
Gytis

[colejensen]

This was it! Thank you!