stay Python in , If there is a parent-child inheritance relationship between the two classes , Even if there are no properties and methods in the subclass , At this point, create a subclass object , Then this subclass object will have the right to use all properties and methods in the parent class , That's what it is Python The concept of inheritance in .
stay Python Testing inheritance , We usually extract one kind of things , With the same characteristics, attributes and behaviors into a class , We call it the father class , It can also be called superclass 、 Base class .
Any class created by inheritance , We call it subclass or derived class , You can directly inherit the properties and methods in the parent class .
Python Object oriented inheritance refers to the relationship between multiple classes , That is, the child class inherits all the properties and methods of the parent class by default , As follows ：
# Inherit ： The subclass inherits all the properties and methods of the parent class by default
# 1. Define parent class Parent
class Parent(object):
def __init__(self):
self.num = 1
def info_print(self):
print(self.num)
# 2. Defining subclasses Child Inherited parent class Parent
class Child(Parent):
pass
# establish Child Class instance , Call the parent class Parent Methods and properties in
ch = Child()
print(ch.num) # 1
ch.info_print() # 1
explain ： stay Python in , All classes inherit by default
objectclass ,objectA class is a top-level class or a base class , Other subclasses areobjectThe derived class .
Single inheritance ： A parent class is inherited by only one subclass , It's called single inheritance .
The main line of the story ： A pancake and fruit teacher , I've been in the pancake industry for many years , Developed a set of exquisite techniques for spreading pancakes and fruits . Master wants to teach this technique to his only and most proud apprentice .
# 1. Master class , Properties and methods
class Master(object):
def __init__(self):
self.gongfu = '[ Old recipe for pancakes and fruit ]'
def make_cake(self):
print(f' Application {self.gongfu} Make pancakes and fruit ')
# 2. Define apprentice class , Inherit master class
class Prentice(Master):
pass
# 3. Create objects tudi
tudi = Prentice()
# 4. Object access instance properties
print(tudi.gongfu) # [ Old recipe for pancakes and fruit ]
# 5. Object calls instance methods
tudi.make_cake() # Application [ Old recipe for pancakes and fruit ] Make pancakes and fruit
The story advances ： The apprentice is a good student who loves to learn , I want to learn more about pancake fruit technology , So I searched for college pancake fruit , Decided to learn more pancake fruit technology in the College .
The so-called multiple inheritance means that a class inherits more than one parent class at the same time .
# 1. Create master class , Properties and methods
class Master(object):
def __init__(self):
self.gongfu = '[ Old recipe for pancakes and fruit ]'
def make_cake(self):
print(f' Application {self.gongfu} Make pancakes and fruit ')
# 2. Create an academic class Properties and methods
class School(object):
def __init__(self):
self.gongfu = '[ College pancake fruit recipe ]'
def make_cake(self):
print(f' Application {self.gongfu} Make pancakes and fruit ')
# 2. Define apprentice class , Inherit master class and Master class
class Prentice(School, Master):
pass
# 3. Create objects tudi
tudi = Prentice()
# 4. Object access instance properties
print(tudi.gongfu)
# 5. Object calls instance methods
tudi.make_cake()
"""
Output content ：
[ College pancake fruit recipe ]
Application [ College pancake fruit recipe ] Make pancakes and fruit
"""
summary ：
class Prentice(School, Master):
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