The python modules and packages

# 模块 module


def my_sum(*args):                                # 求和函数

    result = 0
    for item in args:
        result += item

    return result


# print(my_sum(1, 2, 3, 4))                       # 10


def my_max(*args):                                # 打印最大值标志----此处仅仅打印一点内容
    print("最大值")


def my_min(*args):
    print("最小值")


class People:                                    # 定义一个类

    def __index__(self, name, age):
        self.name = name
        self.age = age


MAX_NUM = 100                                    # 定义一个变量

Above functions or classes may also be used in other .py files, then I should be allowed above may be used by other files. This method is equivalent to the C language header file

What I add a .py file in the project, you will want to share functions into them

This can create a new package, named demo, drag the file to the demo above helloworld.py

Create a .py file on helloworld, the demo file and directory at the same level

In the following input test.py

from demo.helloworld import my_sum

print(my_sum(1, 2, 3, 4, 5))                # 15 可以使用helloworld.py中定义的求和函数