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()