题解 | #合法IP#
合法IP
https://www.nowcoder.com/practice/995b8a548827494699dc38c3e2a54ee9
def f(ip):
if len(ip) != 4:
return False
else:
for i in ip:
if not i.isdigit():
return False
if int(i) < 0 or int(i) > 255 or (i[0] == '0' and len(i) > 1):
return False
return True
ip = input().split('.')
if f(ip):
print('YES')
else:
print('NO')
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