title: AttributeError in Python object has no attribute
body: <p>i Keep getting the attribute error for "add" but i have added it in the Calculator file. any ideas?<a href="https://i.stack.imgur.com/0nsBy.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0nsBy.png" alt="enter image description here"></a></p>