
def add_fruit(inventory, fruit, quantity = 0):
    inventory[fruit] = quantity
    return None

new_inventory = {}
add_fruit(new_inventory,"strawberries",10)
print("strawberries" in new_inventory)
print(new_inventory["strawberries"] == 10)
add_fruit(new_inventory, "strawberries", 25)
print(new_inventory["strawberries"] == 35)
