如何编写平衡符号的程序？

def is_balanced_symbols(symbols):
    stack = []
    opening_symbols = ['(', '[', '{']
    closing_symbols = [')', ']', '}']
    matching_symbols = {'(': ')', '[': ']', '{': '}'}

    for symbol in symbols:
        if symbol in opening_symbols:
            stack.append(symbol)
        elif symbol in closing_symbols:
            if len(stack) == 0:
                return False
            opening_symbol = stack.pop()
            if matching_symbols[opening_symbol] != symbol:
                return False

    return len(stack) == 0

# 示例用法
symbols = "[()]{}"
if is_balanced_symbols(symbols):
    print("符号序列是平衡的")
else:
    print("符号序列不是平衡的")