Python Stacks

^This is my Stacks data structure in Python.

^This is an example of check_delimiters, but it only applies to "()". I do not know how to do the delimiters that include "{([

1 # 2 class Stack: 3 4 5 class Node: def init (self, val, next-None): self.val - val self.next next 7 def init (self) self.topNone 10 def push(self, val): 12 13 14 15 16 17 18 19 20 21 self.top Stack.Node (val, self.top) = def pop(self): assert self.top, Stack is empty val - self.top.val self.top = self.top.next returnval def peek(self): return self.top.val if self.top else None 23 2 4 25 26 27 28 29 30 3 1 32 def empty(self): return self.topNone def bool (self) return not self.empty() def-repr-(self): if not self.top: return'' return "-->'+','.join(str (x) for x in self) 3 4 35 36 3 7 3 8 def it er-(self): n - self.top while n: yield n.val n = n. next