in keyword
Just like with strings, you can use the built-in
in keyword with lists to check if a list contains a given element. The in keyword returns a boolean value (True or False) depending on whether the element is found in the list.Here’s an example of using the
in keyword with a list:fruits = ['apple', 'banana', 'orange', 'grape']
if 'apple' in fruits and 'banana' in fruits:
print('We have both apples and bananas!')In this example, we use the
and operator to check if both apple and banana are in the fruits list. If both are present, the if statement is True, and the message We have both apples and bananas! is printed.Challenge
You are helping the famous “Four Ingredients” cafe write their order processing system. The first four lines of input list the ingredients of a menu item, while the next two lines list the ingredients that a customer is allergic to. Your task is to print
Order accepted! if there are no allergens in the ingredients or Allergen alert! if a customer is allergic to one or more ingredients.Input | Output |
egg
apple
flour
brown sugar
apple
strawberry | Allergen alert! |
spinach
feta
egg
short crust pastry
peanut
honey | Order accepted! |
Constraints
Time limit: 2 seconds
Memory limit: 512 MB
Output limit: 1 MB