Hash value of wx.DateTime

wxPython Users
1

Hash value of wx.DateTime
Hi,

I’ve been using wxPython at work as part of rewriting a lot of our user interface and just wanted to say firstly; thanks to all the developers! It’s a really nice package, especially since a lot of our legacy code uses wxWidgets.

However, I recently ran into what I think might be a problem. While doing some work with DateTimes, I found that wx.DateTime objects representing the same date and time hash to different values. Specifically, they hash to their id. So if you have:

date1 = wx.DateTime().Set(01,01,2007,12,00,00,00)

date2 = wx.DateTime().Set(01,01,2007,12,00,00,00)

then;

date1 == date2

True

but

date_set = set(date1)

date2 in date_set

False

This is not what I’d expect, as the Python documentation (v2.4.3) says that if you’re making your own objects, then the hash() method of two equal objects should return the same value for both. Since date1 is equal (as far as I can tell) to date2, I expected it to hash to the same value and thus work as expected in set membership. Is this a bug, or is this intended behaviour? If it’s intended behaviour, then can you explain to me why it’s this way? If it is intended, then it’s no problem as I can always make my own DateTime subclass that just overrides the hash() function, but my main concern was that I may have found a bug.

Thanks for your time :slight_smile:

Tom Dalton