Issue 17875: Set Intersection returns unexpected results (original) (raw)

Issue17875

Created on 2013-04-30 05:04 by Afif.Elghraoui, last changed 2022-04-11 14:57 by admin. This issue is now closed.

Messages (2)
msg188125 - (view)	Author: Afif Elghraoui (Afif.Elghraoui)	Date: 2013-04-30 05:04
I have two lists of strings (gene identifiers) that I know have something in common. I convert them to lists and do an intersection and I get the empty set. As an example test case, I know they both have the string 'Rv0500' >>> list1.index('Rv0500') 278 >>> list2.index('Rv0500') 245 >>> set(list1).intersection(set(list2)) set([]) I was expecting to get a few hundred matches. My two lists are attached to this report. This is how I created the data file: >>> x = shelve.open('lists.dat') >>> x['list1'] = list1 >>> x['list2'] = list2 >>> x.close() I did my best to make this report complete-- thanks for all your help.
msg188132 - (view)	Author: Mark Dickinson (mark.dickinson) *	Date: 2013-04-30 07:04
It appears that your list1 and list2 are not regular Python lists, but have type cobra.core.DictList (which inherits from list, but overrides the 'index' method). cobra is a 3rd party package, not maintained by the Python developers, so I'm afraid this isn't the right place to ask about it; is there a mailing list for the cobra package?