Python实现的括号匹配判断功能示例

# -*- coding: utf8 -*-
# 符号表
SYMBOLS = {'}': '{', ']': '[', ')': '(', '>': '<'}
SYMBOLS_L, SYMBOLS_R = SYMBOLS.values(), SYMBOLS.keys()
def check(s):
 arr = []
 for c in s:
  if c in SYMBOLS_L:
   # 左符号入栈
   arr.append(c)
  elif c in SYMBOLS_R:
   # 右符号要么出栈，要么匹配失败
   if arr and arr[-1] == SYMBOLS[c]:
    arr.pop()
   else:
    return False
 return True
print(check("3 * {3 +[(2 -3) * (4+5)]}"))
print(check("3 * {3+ [4 - 6}]"))

# -*- coding: utf8 -*-
# 存储左括号和右括号
open_brackets = '([{<'
close_brackets = ')]}>'
# 映射左右括号便于出栈判断
brackets_map = {')': '(', ']': '[', '}': '{', '>': '<'}
# 对于每一行数据，进行如下判定若括号为左括号，加入栈，若括号为右括号，判断是否跟栈尾括号对应，
# 若对应，弹出栈尾元素，若所有括号均正确闭合，则最后栈为空。
rows = [
'([<^>x[ ]{a}]{/}{t}g<^>)<{x}b>{x}<z({%}w >[b][c[c]]{<h>{h}}',
 '[/]{((x)({{*}*}w)w){f}{v}[%(^[z]{u}{ })([[ ]-]h)]{c}(*)[y]}',
 '<<(^)z>>[b]< >[[(c)u[v]{z<b< >><b>}]g][/b[(])v(v)(+)](v)',
 '[[b]][(v)g]<z>([{{<->+}e}[*]d<+>]g[[a] <+>(v){b}<e>]){a}[u]']
for row in rows:
 stack = []
 label = True
 for char in row:
  if char in open_brackets:
   stack.append(char)
  elif char in close_brackets:
   if len(stack) < 1:
    label = False
    break
   elif brackets_map[char] == stack[-1]:
    stack.pop()
   else:
    label = False
    break
  else:
   continue
 if stack != []:
  label = False
 print(label)

#!usr/bin/env python
# encoding:utf-8
def bracket_mathch(one_str):
 '''''
 括号匹配
 '''
 tmp_list = []
 open_bracket_list = ['(', '[', '{', '<', '《']
 close_bracket_list = [')', ']', '}', '>', '》']
 one_str_list = list(one_str)
 length = len(one_str_list)
 set_list = list(set(one_str_list))
 num_list = [one_str_list.count(one) for one in set_list]
 if one_str[0] in close_bracket_list:
  return False
 elif length % 2 != 0:
  return False
 elif len(set_list) % 2 != 0:
  return False
 else:
  for i in range(length):
   if one_str[i] in open_bracket_list:
    tmp_list.append(one_str[i])
   elif one_str[i] in close_bracket_list:
    if close_bracket_list.index(one_str[i]) == open_bracket_list.index(tmp_list[-1]):
     tmp_list.pop()
    else:
     return False
     break
 return True
if __name__ == '__main__':
 one_str_list = ['({})', '({[<《》>]})', '[(]){}', '{{{{{{', '([{}])', '}{[()]']
 for one_str in one_str_list:
  if bracket_mathch(one_str):
   print(one_str, '正确')
  else:
   print(one_str, '错误')
 tmp = '{}[{()()[]<{{[[[[(())()()(){}[]{}[]()<>]]]]}}>}]'
 print(bracket_mathch(tmp))