print的format()用法

# 类 ，属性，方法
# class Person:
# def __init__(self, name, age):
# self.name = name
# self.age = age

# def sayhi(self):
# print('my name is {},i am {} years old.'.format(self.name,self.age)) # 格式化输出
# print('my name is',self.name +',' + 'i am',self.age +' years old.')
# p=Person('sophia', '18')
# p.sayhi()