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Title: datetime comparison with 'None' returning a TypeError
Type: behavior Stage: resolved
Components: Tests Versions: Python 2.7
Status: closed Resolution: not a bug
Dependencies: Superseder:
Assigned To: Nosy List: eric.smith, pythoner
Priority: normal Keywords:

Created on 2014-10-05 08:38 by pythoner, last changed 2022-04-11 14:58 by admin. This issue is now closed.

File name Uploaded Description Edit pythoner, 2014-10-05 08:38 Date Sorting
Messages (2)
msg228543 - (view) Author: Ankit Dhebar (pythoner) Date: 2014-10-05 08:38
code snippet
student_tuple = [ ('ykjsdf', 'A', 17,,10,15)), ('accjr', 'C', 11,,05,05)), ('dgekw', 'B', 5,,03,03)) ]

Output for the above code works as expected.
o/p : [('dgekw', 'B', 5,, 3, 3)), ('accjr', 'C', 11,, 5, 5)), ('ykjsdf', 'A', 17,, 10, 15))]

but when you make one of the above as 'None' like below

student_tuple = [ ('ykjsdf', 'A', 17,,10,15)), ('accjr', 'C', 11, None), ('dgekw', 'B', 5,,03,03)) ]
o/p : TypeError: can't compare to NoneType

In my opinion, the 'NoneType' should appear either in the beginning or towards the end after sorting is done.
msg228566 - (view) Author: Eric V. Smith (eric.smith) * (Python committer) Date: 2014-10-05 13:52
You've identified the main problem: would None go first or last? Modify your key function to make the decision appropriate for you, returning either a very small or very large value for None, as appropriate.

If you really want to see this behavior changed, you should have a concrete proposal and bring it up on the python-ideas mailing list.
Date User Action Args
2022-04-11 14:58:08adminsetgithub: 66746
2014-10-05 13:52:42eric.smithsetstatus: open -> closed

type: compile error -> behavior

nosy: + eric.smith
messages: + msg228566
resolution: not a bug
stage: resolved
2014-10-05 08:38:46pythonercreate