python Class：物件導向進階編程 __str__ / __repr__

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其實：__str__ 與 __repr__效果一樣， 人們說：__str__ 是面向使用者的， 而__repr__是面向程式員的， 轟朵你？

官網解釋：

• object.__repr__(self)?

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

• object.__str__(self)?

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

看瞭解釋，哪裡說是面向使用者，哪裡又說面向程式員了？？？？看到加粗字了沒有，看到下滑線了沒有？？？這裡說的是作用於所有人好嘛！！！如果非要以自己的職位來說，好吧，好像是這麼一回事，真是 淫穢  隱晦的表達。

不說了，先小試一下：

#!/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

print Str('you')

print Repr('me')

最近非常的狂，不，不是最近，而是這個階段的我，非常喜歡懟，如果我表達不好，那真是 抱歉了 。。。 你有理，你也來懟我啊，來啊，相互傷害啊！！！

python Class：物件導向進階編程 __str__ / __repr__