def isnumber(s):
if s.isdigit() and len(s) <= 9:
return True
else:
print('you should input number and length less than 9')
return False
def main():
s = input('What is your number')
while not isnumber(s):
s = input('What is your number')
print("your number is", s)
if __name__ == "__main__":
main()
事实上,我亲爱的朋友,你不能限制输入功能,但你可以通过这种方式实现你想要的:
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