使用栈进行复杂符号匹配

from pythonds.basic.stack import Stack
def parchecker(SymbolString):
    s=Stack()
    balance=True
    index=0
    while index<len(SymbolString) and balance:
        if SymbolString[index] in '{[(':
            s.push(SymbolString[index])
        elif s.isEmpty():
            balance=False
        else:
            top=s.pop()
            if not match(top,SymbolString[index]):
                balance=False
        if s.isEmpty() and balance:
            return True
        else:
            return False
def match(open,close):
    a='{[('
    b='}])'
    if a.index(open)==b.index(close):
        return True
    else:
        return False
print(parchecker('{{([][])}()}'))