Peter Otten wrote: > Robert Latest wrote: > >> Paul Rubin wrote: >>> The attribute is on instances of File, not on the class itself. See >>> if this works: >>> >>> flist.sort(key=lambda f: f.mod_date.toordinal) >> >> It doesn't throw an error any more, but neither does it sort the list. This, >> however, works: >> >> ---------------------- >> def by_date(f1, f2): >> return f1.mod_date.toordinal() - f2.mod_date.toordinal() >> >> flist.sort(by_date) >> ---------------------- >> >> So I'm sticking with it, although I sort of liked the key approach. >> >> robert > > This should work then: > > def date_key(f): > return f.mod_date.toordinal() > flist.sort(key=date_key) > > This can also be written as > > flist.sort(key=lambda f: f.mod_date.toordinal())
Well, that's almost Paul's (non-working) suggestion above, but it works because of the parentheses after toordinal. Beats me how both versions can be valid, anyway. To me it's all greek. I grew up with C function pointers, and they always work. robert -- http://mail.python.org/mailman/listinfo/python-list
