functools_total_ordering.py

#!/usr/bin/env python


import functools
import inspect
from pprint import pprint


@functools.total_ordering
class MyObject(object):
    def __init__(self, val):
        self.val = val

    def __eq__(self, other):
        print ' testing __eq__(%s, %s)' % (self.val, other.val)
        return self.val == other.val

    def __gt__(self, other):
        print ' testing __gt__(%s, %s)' % (self.val, other.val)
        return self.val > other.val

print 'Methods:\n'
pprint(inspect.getmembers(MyObject, inspect.ismethod))

a = MyObject(1)
b = MyObject(2)

print '\nComparisons:'
for expr in ['a < b', 'a <= b', 'a == b', 'a >= b', 'a > b']:
    print '\n%-6s:' % expr
    result = eval(expr)
    print ' result of %s: %s' % (expr, result)