def run_stack():
s = MyStack()
s.push(5)
v = s.pop()
result = v == 5
print("valid push/pop?: {}".format(result))
try:
s.pop()
except StopIteration as e:
print('correct exception throw')
def __init__(self, size=10):
self.push_stack = MyStack(size=size)
self.pop_stack = MyStack(size=size)
