def push_amount_into_stack(stack, amount):
if not stack:
stack.append(amount)
elif stack[-1] == '*':
stack[-2] = mul(stack[-2], amount.number)
stack.pop()
elif stack[-1] == '/':
stack[-2] = div(stack[-2], amount.number)
stack.pop()
else:
stack.append(amount)
def test_div(self):
amount_ = Amount(D('100'), 'CAD')
self.assertEqual(Amount(D('20'), 'CAD'), amount.div(amount_, D('5')))