#coding:utf-8
'''
    filename: moduleexample.py
'''

class Book:
    lang = "python"
    
    def __init__(self, author):
        self.author = author

    def get_name(self):
        return self.author

def foo(x):
    return x * 2

#python = Book("laoqi")
#python_name = python.get_name()

#mul_result = foo(2)

if __name__ == "__main__":    #⑤
    python = Book("laoqi")
    python_name = python.get_name()
    print(python_name)

    mul_result = foo(2)
    print(mul_result)