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【Python Practice】Day 12 Question 44-46


'''
@Author: your name
@Date: 2020-07-18 19:18:56
@LastEditTime: 2020-07-19 10:28:39
@LastEditors: Please set LastEditors
@Description: In User Settings Edit
@FilePath: \vscode_py\day12.py
'''
# Question 44#
# 使用map映射一个迭代器,并输出
def Q44():
r=list(map(lambda x:x**2,range(1,21))) # map的用法就是
print(r)

# Question 45
# staticmethod
# 类的静态成员函数,在类没有被实例化的时候可以直接运行
class American():
@staticmethod
def printNationlity():
print("I am a American")

# Question 46
# 定义一个class,并定义一个子类
class Newyorker(American):
@staticmethod
def printNationlity():
print("I am a Newyorker")



if __name__ == "__main__":
# Q44()

american=American()
american.printNationlity()
American.printNationlity()

petter=Newyorker()
petter.printNationlity()
Newyorker.printNationlity()


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