python 2 and python 3 __cmp__ -

when use code in python 2 works fine while python 3 gives me error

 class point:          def __init__(self,x,y):             self.x=x             self.y=y          def dispc(self):             return ('(' +str(self.x)+','+str(self.y)+')')          def __cmp__(self,other):             return ((self.x > other.x) , (self.y > other.y)) 

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shubham@shubham-vpcea46fg:~/documents/programs$ python3 -i classes.py  >>> p=point(2,3) >>> q=point(3,4) >>> p>q traceback (most recent call last):   file "<stdin>", line 1, in <module> typeerror: unorderable types: point() > point() >>>  shubham@shubham-vpcea46fg:~/documents/programs$ python -i classes.py  >>> p=point(2,3) >>> q=point(3,4) >>> p>q false >>>  

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in python 3 gives error on and while works == , !=.

please suggest solution.

you need provide __lt__ , __eq__ method ordering in python 3. __cmp__ no longer used.

updated respond questions/comments below

__lt__ takes self , other arguments, , needs return whether self less other. example:

class point(object):     ...     def __lt__(self, other):         return ((self.x < other.x) , (self.y < other.y)) 

so if have following situation:

p1 = point(1, 2) p2 = point(3, 4)  p1 < p2 

this equivalent to:

p1.__lt__(p2) 

which return true. __eq__ return true if points equal , false otherwise. if use functools.total_ordering decorator recommended below, need provide __lt__ , __eq__:

from functools import total_ordering  @total_ordering class point(object):     def __lt__(self, other):         ...      def __eq__(self, other):         ...