python Class:面向对象高级编程 __str__ / __repr__

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其实:__str__ 与 __repr__效果一样, 人们说:__str__ 是面向用户的, 而__repr__是面向程序员的, 轰朵你?


官网解释:

  • object.__repr__(self)

  • Called by the repr() built-in function and by string conversions (reverse quotes) to compute the “official” string representation of an object.  If at all possible, this should look like a valid Python expression that could be used to recreate an object with the same value (given an appropriate environment).  If this is not possible, a string of the form <...some useful description...>should be returned.  The return value must be a string object. If a class defines __repr__() but not __str__(), then __repr__() is also used when an “informal” string representation of instances of that class is required.


  • object.__str__(self)

  • Called by the str() built-in function and by the printstatement to compute the “informal” string representation of an object.  This differs from __repr__() in that it does not have to be a valid Python expression: a more convenient or concise representation may be used instead. The return value must be a string object.


看了解释,哪里说是面向用户,哪里又说面向程序员了????看到加粗字了没有,看到下滑线了没有???这里说的是作用于所有人好嘛!!!如果非要以自己的职位来说,好吧,好像是这么一回事,真是 淫秽  隐晦的表达。


不说了,先小试一下:

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

class Student(object):
     def __init__(self, name):
         self.hah = name
        
class Str(Student):
     def __str__(self):
       return  'Str (name: %s)' %self.hah


class Repr(Student):
     def __repr__(self):
       return  'Repr(name: %s)' % self.hah


s = Student('Michael')
print s.hah

技术分享图片

print Str('you')

技术分享图片

print Repr('me')

技术分享图片


最近非常的狂,不,不是最近,而是这个阶段的我,非常喜欢怼,如果我表达不好,那真是 抱歉了 。。。 你有理,你也来怼我啊,来啊,相互伤害啊!!!

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