Is It Safe To Just Implement __lt__ For A Class That Will Be Sorted?

Suppose instances of my ClassA will end up in a data structure and we know sorted() will be called on it. It's someone else's code that'll call sorted() so I can't specify a sorti

Solution 1:

PEP 8 recommends against this practice. I also recommend against it because it is a fragile programming style (not robust against minor code modifications):

Instead, consider using the functools.total_ordering class decorator to do the work:

@total_ordering
class Student:
    def __eq__(self, other):
        return ((self.lastname.lower(), self.firstname.lower()) ==
                (other.lastname.lower(), other.firstname.lower()))
    def __lt__(self, other):
        return ((self.lastname.lower(), self.firstname.lower()) <
                (other.lastname.lower(), other.firstname.lower()))