pycharm_debug

def aa():
    print("run in aa() start!!!!!")
    print("step1")
    num1 = 3
    num1 = 5
    num2 = num1 * 2
    num3 = num1 * 3
    print("step2")
    print("run in aa() end!!!!!")


if __name__ == '__main__':
    print("main:step1")
    aa()
    print("main:step2")
    print("mian:end!!!")

参考视频