正文
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# -*- coding: utf-8 -*-
class Stack:
def __init__(self):
self.stack = []
def push(self, element):
self.stack.append(element)
def pop(self):
return self.stack.pop()
def get_top(self):
if len(self.stack) > 0:
return self.stack[-1]
else:
return None
def is_empty(self):
return len(self.stack) == 0
def brace_match(s):
match = {'}': '{', ']': "[", ')': '('}
stack = Stack()
for ch in s:
if ch in {'(', '[', '{'}:
stack.push(ch)
else: # ch in {'}',']',')'}
if stack.is_empty():
return False
elif stack.get_top() == match[ch]:
stack.pop()
else: # stack.get_top() != match[ch]
return False
if stack.is_empty():
return True
else:
return False
print(brace_match('[{()}(){()}[]({}){}]'))
print(brace_match('[]}'))