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while_parrot.py

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prompt = '\nTell me something, and I will repeat it back to you: '

prompt += '\nEnter "q" or "Q" to end the program. '

message = ' '#没有可供比较的值时程序无法运行，因此需要给message赋一个初值，

#且这个初值是空格，符合执行while循环的条件

while message != 'q' and message != 'Q':

message = input(prompt)

if message != 'q' and message != 'Q':

print('\n' + message)