这里对深入条件控制的知识点做一下测试：用作普通值而不是布尔值时，短路运算符的返回值通常是最后一个求了值的参数。

a=2

c=5
for b in [0,1]:
    print((a and b and c))

运行结果

E:\Python\Python38\python.exe D:/pythonprojects/python-auto-test/test/tiaojiankongzhi.py
0
5

Process finished with exit code 0