while补充，字符串和数字的内置方法

while True:
    name=input('please input your name: ')
    password=input('please input your password: ')

    if name == 'egon' and password == '123':
        print('login successfull')
        while True:
            cmd=input('>>: ')
            if cmd == 'quit':
                break
            print('====>',cmd)
        break

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