RetroSearch Browse

Wed Aug 22 06:40:42 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-August/155015.html

Why compare twice?

class Student(object):

    def __init__(self, name, score):
        self.name = name
        self.score = score

    def __str__(self):
        return '(%s: %s)' % (self.name, self.score)

    __repr__ = __str__

    def __lt__(self, s):
        #print(self, '--', s)
        if(self.score<s.score):
            print(self, '<', s)
            return True
        if(self.score>s.score):
            print(self, '>', s)
            return False
        if(self.score==s.score):
            if(self.name>s.name):
                print(self, '>', s)
                return False
            if(self.name<s.name):
                print(self, '<', s)
                return True
            if(self.name==s.name):
                print(self, '==', s)
                return False

    def __eq__(self, s):
        return (self.score == s.score) and (self.name == s.name)
    def __gt__(self, s):
        return not ((self == s) or (self < s))
    def __le__(self, s):
        return ((self == s) or (self < s))
    def __ge__(self, s):
        return ((self == s) or (self > s))
    def __nq__(self, s):
        return not (self == s)

L = [Student('Tim', 22), Student('Bob', 33), Student('Kevin', 11), Student('Alice', 11)]

print(sorted(L))

Output:
(Bob: 33) > (Tim: 22)
(Kevin: 11) < (Bob: 33)
(Kevin: 11) < (Bob: 33)
(Kevin: 11) < (Tim: 22)
(Alice: 11) < (Tim: 22)
(Alice: 11) < (Kevin: 11)
[(Alice: 11), (Kevin: 11), (Tim: 22), (Bob: 33)]

Best regards,
Xiaofeng
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20180822/708a349e/attachment.html>

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://mail.python.org/pipermail/python-dev/2018-August/155015.html below:

[Python-Dev] Issue?