def check_bal_par_2(par_str):
if not len(par_str):
return True
if len(par_str) % 2 != 0:
return False
s = Stack()
for item in par_str:
if s.is_empty():
s.push(item)
else:
if s.peek() == '(' and item == ')' or \
s.peek() == '[' and item == ']' or \
s.peek() == '{' and item == '}':
s.pop()
else:
s.push(item)
return s.is_empty()
from stack.Stack import Stack s = Stack() print(s.get_size()) print(s.is_empty()) print(s.peek()) s.print_stack() s.push(5) s.push(2) s.push(28) s.push(11) s.push(18) print(s.get_size()) print(s.is_empty()) print(s.peek()) s.print_stack() print(s.pop()) print(s.pop()) print(s.pop()) print(s.pop()) print(s.pop()) s.print_stack()
