Python some custom methods (functions)

__str__() __call__() __repr__()Method

>>> class Student (object):    def __init__ (self, name):        self.name = name    def __call__ (self):        Print (' My name is%s. '% self.name)    def-__str__ (self): return ' I am a print call for name:%s! ' %self.name    def __repr__ (self): return ' I am a print var value for name:%s! ' %self.name>>> s = Student (' Lucy ') >>> s     //call __repr__ () I am a print var value for Name:lucy!>&G t;> s ()   //Call __call__ () My name was lucy.>>> print S    //call __str__ () I am a print call for Name:lucy !

　　

 __str__是调用print 打印，

__repr__是直接写变量时打印的

__iter__ ()方法

如果一个类想被用于for ... in循环，类似list或tuple那样，就必须实现一个__iter__()方法

__getitem__()Method

To act as a list to take out elements according to subscript, you need to implement the __getitem__() method

__getattr__()Method

That is to write a __getattr__() method that dynamically returns a property

class Student(object):    def __init__(self): self.name = ‘Michael‘ def __getattr__(self, attr): if attr==‘score‘: return 99
　　raise AttributeError(‘\‘Student\‘ object has no attribute \‘%s\‘‘ % attr) //调用不存在的属性是，抛出

>>> s = Student()>>> s.name‘Michael‘>>> s.score99

This section describes some of the most commonly used customization methods, as well as a number of customizable methods, please refer to the official Python documentation.
Http://docs.python.org/2/reference/datamodel.html#special-method-names

Python some custom methods (functions)