Python calls the parent class method

This article and everyone to share is mainly in Python development , call the parent class two methods similarities and differences, I hope to learn from you and use the Python language is helpful.

There are two ways to call the parent class in Python: super (Child, Self). Method (args) and Parent.method ( Self, args) . I used one of these to report the following error:

I can't find them . Classobj . When I change the call to super (B, self), F (name) works correctly and the result is correct.

parsing errors

because the base class does not inherit Object , in python , one can be created like this:

class A:

Pass

You can also create this:

class A(object):

Pass

The difference between the two is:

This is the old class . ( former ) and new types ( latter ) the difference.

Python3 has removed the old type, meaning that it has implicitly inherited the object , so thePython3 does not write the inheritance Object there's no difference.

Two different types of calls

What is the difference between parent.__init__ (self) and super (Child, self). __init__ () ?

Super understands the parent class as well,Python actually refers to the next class in MRO!

Super actually did this , look at the answer :

def Super(CLS, inst):

MRO = Inst.__class__.mro () # Always the most derived class

return mro[mro.index (CLS) + 1]

MRO Full name Method Resolutionorder, which represents the order in which classes inherit.

Super is used to solve multiple inheritance problems , assuming B C D is directly inheriting class A

class E(B, C, D):

def __init__(self):

# code ...

if the Class E constructor uses super (E, self). __init__ () , The Class A constructor is executed once, and in another way,a The constructor of the class is executed multiple times.

in MRO , the base class always appears after the derived class, and if there are multiple base classes, the relative order of the base classes remains unchanged.

Source: Habitat later than one mound

Python calls the parent class method