Python编程-基础知识-条件判断

1. 简单的if/else条件判断

judge_flow.py

name = input("Please input name: ")
if name == 'master':
    print('Hello Master')
    password = input('Please input password: ')
    if password == 'abc123':
        print('Access granted.')
    else:
        print('Wrong password!')
else:
    print('Invalid user!')

运行结果:

Please input name: david
Invalid user!

Please input name: master
Hello Master
Please input password: aaa
Wrong password!

Please input name: master
Hello Master
Please input password: abc123
Access granted.

2. 多项条件判断

elif statements

judge_flow_multiple.py

age = int(input("Input your age: "))
if age < 5:
    print('Hi, Baby.')
elif age < 12:
    print('Hi Child.')
elif age < 100:
    print('Hi Man')
else:
    print('Your Majesty')

运行结果:

Input your age: 3
Hi, Baby.

Input your age: 90
Hi Man

Input your age: 1000
Your Majesty