gistfile1.txt

# ! /usr/bin/env python
# -*- coding: utf-8 -*-

class Pair:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        
    def __repr__(self):
        return 'Pair({0.x!r}, {0.y!r})'.format(self)
 
    def __str__(self):
        return '({0.x!s}, {0.y!s})'.format(self)

In[1]: p = Pair(3, 4)
In[2]: print ('p is {0!r}'.format(p))
p is Pair(3, 4)

或者这样实现

def repr(self):
return 'Pair (%r, %r)' % (self.x, self.y)