How to know if a value exists in three separate lists?-CodePudding

If I have three lists of strings like the below how do I iterate through the list in order to identity if a specified ingredient say 'banana' is in any of the lists? I need to define a function that outputs either true or false.

menu = [
         ['soup','onion','potato','leek','celery'],
         ['pizza','bread','tomato','cheese','cheese'],
         ['banana']
       ]

CodePudding user response：

You need to check in each of the sub-lists, you can use any built-in passing the generator expression

>>> any('banana' in v for v in menu)
True

CodePudding user response：

Credit to @ThePyGuy for the logic, but here is a very similar answer, defined as a function.

def check_menu(item, menu):
    if any(item in v for v in menu):
        return True
    else:
        return False 

print(check_menu('banana',menu))
True
print(check_menu('mushroom',menu))
False

This way you can have it check whatever menu, or item in the menu you want.

CodePudding user response：

use "any" if only one is enough, if you seek that word in "all" list use all :)