Elegant Python-What Is Magic method

We often see a variety of methods that are surrounded by double underlines, such as __init__, which are magic methods.

The Magic method is the Python language pre-ordered "protocol", different magic methods in different scenarios, will be implicitly called. We manipulate various behaviors by overloading these methods.

Class A (object):    def __str__ (self):        return ' I am a,2333 '    def __len__ (self):        return 42a = A () print a# output "I Am a,2333 "Print len (A) #输出42

As you can see, the print statement implicitly calls the __str__ method, and Len () implicitly calls the __len__ method.

Python has ordered a rich magic method that allows us to fine-grained control of a variety of behaviors, use a variety of acid cool, more magic methods See <python Magic Method Guide >

Elegant Python-What Is Magic method