栈的应用——括号匹配问题

from stack import Stack

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('([{()}])'))
print(brace_match('[]('))
print(brace_match('[(])'))