Using if statements with user inputs

I am trying to create a simple product inventory using python but for some reason the if statement won't run and I don't know what's wrong. Below is the output and inputs of the code.

#Code

def inventory_products():
    choice = str(input("What do you want to do? \nEnter Add item, Quantity, Show Inventory:"))
    if choice == 'Add item':
        input("Enter name")
inventory_products()

#Output

What do you want to do? 
Enter Add item, Quantity, Show Inventory:Add item 

Process finished with exit code 0