repe和str函数的区别

你的名字 2021-05-12 11:55 381阅读 0赞

先看下例子：

>>> class Tesa(object):
    ...     def __init__(self, value='a'):
    ...         self.data = value
    ... 
    >>> a = Tesa()
    >>> a
    <__main__.Tesa object at 0x10f91b828>
    >>> 
    >>> print(a)
    <__main__.Tesa object at 0x10f91b828>
    >>> 
    >>>
    >>> 
    >>> class Tesb(object):
    ...     def __init__(self, value='b'):
    ...         self.data = value
    ...     def __repr__(self):
    ...         return 'fdsfdsf'
    ... 
    >>> 
    >>> b = Tesb()
    >>> b
    fdsfdsf
    >>> print(b)
    fdsfdsf
    >>> repr(b)
    fdsfdsf
    >>> str(b)
    fdsfdsf
    >>> 
    >>> 
    >>> 
    >>> class Tesc(object):
    ...     def __init__(self, value='a'):
    ...         self.data = value
    ...     def __str__(self):
    ...         return "iiiib"
    ... 
    >>> c = Tesc()
    >>> 
    >>> c
    <__main__.Tesc object at 0x10f91bb70>
    >>> print(c)
    iiiib
    >>> 
    >>> str(c)
    'iiiib'
    >>> repr(d)
    '<__main__.Tesc object at 0x10f91bb70>'
    >>> 
    >>> 
    >>> 
    >>> class Test(object):
    ...     def __init__(self, value='a'):
    ...         self.data = value
    ...     def __repr__(self):
    ...         return 'fdsfdsf'
    ...     def __str__(self):
    ...         return "iiiii"
    ... 
    >>> t = Test('ffee')
    >>> t
    fdsfdsf
    >>> print(t)
    iiiii
    >>> 
    >>> repr(t)
    'iiiii'
    >>>

总结：  
`__repe__`函数返回的信息是数据的元（基础）数据，一般供给程序员查看，通过object和repr（object）来调用  
`__str__`函数返回的是经过转换（修饰）过的数据，一般给用户查看，通过print （objects）来调用

注意：当类没有`__str__`函数时，print（object）函数会调用`__repe__`函数的返回值。  
![这里写图片描述][70]

[70]: /images/20210511/0756907ea4ee4287815318b6ccb967ba.png