Thanks @Symbioquine ; fixed the two errors you cite, but i still get the same error- TypeError: 'NoneType' object is not subscriptable -on line 2, where the “csv_str” variable is defined (not on line 4, where it is invoked -now w/o the quotes).
Got any more insight into what that error msg might actually refer to? (could be many things, according to google, that would trigger this “most common exception in python”)