相关疑难解决方法(0)

之间有什么区别__str__和__repr__在__str__？

我已经看过这个关于在Python中表示字符串的问题,但我的问题略有不同.

这是代码:

>>> class WeirdThing(object):
...     def __init__(self):
...         self.me = time.time()
...     def __str__(self):
...         return "%s" % self.me
...     def __repr__(self):
...         return ";%s;" % self.me
... 
>>> weird_list = [WeirdThing(), WeirdThing(), WeirdThing()]
>>> print weird_list
[;1302217717.89;, ;1302217717.89;, ;1302217717.89;]
>>> "\n".join(weird_list)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
TypeError: sequence item 0: expected string, WeirdThing found

我意识到这有效:

>>> "\n".join(str(wi) for wi in weird_list)
'1302217717.89\n1302217717.89\n1302217717.89'
>>> 

每次我想要将对象连接在一起时,避免这样做仍然会很好.这根本不可能吗？