leetcod(20):有效的符号
代码
class Solution:
def isValid(self, s: str) -> bool:
while True:
if '[]' in s:
s = s.replace('[]', '')
elif '{}' in s:
s = s.replace('{}', '')
elif '()' in s:
s = s.replace('()', '')
else:
break
if len(s)>=1:
return False
else:
return True