Python类定义和类继承详解

class <类名>:
<语句>

#类定义
class people:
#定义基本属性
name = ''
age = 0
#定义私有属性,私有属性在类外部无法直接进行访问
__weight = 0
#定义构造方法
def __init__(self,n,a,w):
self.name = n
self.age = a
self.__weight = w
def speak(self):
print("%s is speaking: I am %d years old" %(self.name,self.age))
 
 
p = people('tom',10,30)
p.speak()

class <类名>(父类名)
<语句>
eg.
class childbook(book)
age = 10

class 类名(父类1,父类2,....,父类n)
<语句1>

#另一个类，多重继承之前的准备
class speaker():
topic = ''
name = ''
def __init__(self,n,t):
self.name = n
self.topic = t
def speak(self):
print("I am %s,I am a speaker!My topic is %s"%(self.name,self.topic))
 
#多重继承
class sample(speaker,student):
a =''
def __init__(self,n,a,w,g,t):
student.__init__(self,n,a,w,g)
speaker.__init__(self,n,t)
 
test = sample("Tim",25,80,4,"Python")
test.speak()#方法名同，默认调用的是在括号中排前地父类的方法

import A
l = A.类()