Will try to repro., could you have a look?
py-1.7 vs 185.0-15x
looks like this occurs if the cacheMap does not exist at the time that cache is purged since _get_modified_time will return None. I can do a quick fix for this
Fixed it. can you review and pull this in please? https://github.com/Sage-Bionetworks/synapsePythonClient/pull/411