`datetime.strptime` accepts incompatible arguments
Bug report
Bug description:
If you over-specify a datetime strptime string, it seems that datetime.strptime when encountering a component that has been specified twice, will overwrite earlier values with more recent ones.
>>> datetime.strptime("200099", "%Y%y") datetime.datetime(1999, 1, 1, 0, 0)
One approach would be to ban over-specified formats, but that would be a problem for someone who wants to, use a format like "%M %B" (e.g. something sortable by month number while also showing month name), so I think we don't want to do that.
Alternatively we could start raising an exception if you get different values from these two things, or possibly a warning.
Or we can just accept that if you use a weird format you should expect weird behavior.
CPython versions tested on:
CPython main branch
Operating systems tested on:
Linux