class mychain(object): #利用鏈表建立棧，鏈表為父類
 length=0
 def __init__(self,value=None,next=None):#創(chuàng)建鏈表，長度并不包含頭部
  self.value=value
  self.next=next
  #mychain.length=mychain.length+1
 def append(self,value=None):
  while self.next!=None:
   self=self.next
  self.next=mychain(value)
  mychain.length=mychain.length+1 #追加時(shí)，鏈表長度增加
 def travle(self):#遍歷鏈表
  print(self.value)
  if self.next!=None:
   self.next.travle()
 def drop (self,value):#刪除特定值的第一個(gè)匹配節(jié)點(diǎn)
  while self.next!=None:
   if self.next.value!=value:
    self=self.next
   else:
    self.next=self.next.next
    mychain.length=mychain.length-1 #刪除時(shí)，鏈表長度減小
    break
 def pop(self):#刪除未節(jié)點(diǎn)
  if self.next!=None:#并不刪除頭結(jié)點(diǎn)
   while self.next.next!=None:
    self=self.next
   self.next=None
   mychain.length=mychain.length-1#彈出為節(jié)點(diǎn)，并減小長度，頭結(jié)點(diǎn)不彈出



class stock(mychain):#棧類
 bottom=None 　　#棧底
 top=None　　　　　#棧頂
 n_count=0　　　　#計(jì)數(shù)
 def Max(self):　　#占中最大值
  if self.next!=None:
   tmp = self.next.value
   while self.next.next!=None:
    self=self.next
    if self.next.value>tmp:
     tmp=self.next.value
   return tmp
  else:
   print('棧為空！')
 def Min(self):#棧中的最小值
  if self.next!=None:
   tmp = self.next.value
   while self.next.next!=None:
    self=self.next
    if self.next.value<tmp:
     tmp=self.next.value
   return tmp
  else:
   print('棧為空！')

 def push(self,value): #壓棧
  while self.next != None:
   self = self.next
  self.next = mychain(value)
  stock.top=self.next
  stock.length=stock.length+1
  stock.n_count=stock.n_count+1
 def __init__(self,value='',next=None):
  self.value=value
  self.next=next
  stock.bottom=self
  stock.top=self
  #stock.n_count=stock.n_count+1
  #stock.length=stock.length+1
 def append(self,value=''):#取消追加函數(shù)
  print('請(qǐng)使用Push()!')
 def pop(self):
  if self.next!=None:#并不刪除頭結(jié)點(diǎn)
   while self.next.next!=None:
    self=self.next
   self.next=None
   stock.top=self
   stock.length=stock.length-1#彈出為節(jié)點(diǎn)，并減小長度，頭結(jié)點(diǎn)不彈出
class solution(object):
 def validationofbrackets(self,astr=''):#檢驗(yàn)串中的括號(hào)合法性
  braketsstock=stock()
  for i in astr:
   if i in ['{','(','[']:
    braketsstock.push(i)
   else:
    if i==')':
     if braketsstock.top.value=='(':
      braketsstock.pop()
     else:
      return False
    elif i==']':
     if braketsstock.top.value=='[':
      braketsstock.pop()
     else:
      return False
    elif i=='}':
     if braketsstock.top.value=='{':
      braketsstock.pop()
     else:
      return False
    else:
     pass
  print(astr)
  print(braketsstock.length)
  if braketsstock.length==0:
   return True
  else:
   return False

bstr='([{((({{}})))}]){{}}{{}{}{}[][]()(123)(((sin5)))}'
f=solution()
print(f.validationofbrackets(bstr))