python 类基本写法-默认方法init

class Animal: 
  
    # default constructor 
    def __init__(self): 
        self.dog = "bulldog"
  
    # a method for printing data members 
    def print_dog(self): 
        print(self.dog) 
  
  
# creating object of the class 
obj = Animal() 
  
# calling the instance method using the object obj 
obj.print_dog() 

bulldog


class Addition: 
    #first = 0
    #second = 0
    #answer = 0
      
    # parameterized constructor 
    def __init__(self, f, s): 
        self.first = f 
        self.second = s 
      
    def display(self): 
        print("First number = " + str(self.first)) 
        print("Second number = " + str(self.second)) 
        print("Addition of two numbers = " + str(self.answer)) 
  
    def calculate(self): 
        self.answer = self.first + self.second 
  
# creating object of the class 
# this will invoke parameterized constructor 
obj = Addition(1000, 2000) 
  
# perform Addition 
obj.calculate() 
  
# display result 
obj.display() 

First number = 1000
Second number = 2000
Addition of two numbers =3000


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