sorting groceries by position in store

[bionoob]

Thak you all! This helped me already quite a lot.

The code looks now like this: 

locations = {'banana': 1, 'steak': 5, 'water': 9, 'cheese': 4, 'spam': 2, 'pizza': 8}
groceries = ['banana', 'steak', 'spam', 'cheese', 'pizza']
groceries.sort(key = lambda x: locations[x])

for item in groceries:
   print('{} is located in isle: {}'.format(item, locations[item]))

Output:
banana is located in isle: 1
spam is located in isle: 2
cheese is located in isle: 4
steak is located in isle: 5
pizza is located in isle: 8

in the output are the items ordered after their values as stated in the dictonairy, that´s perfect.
Next step would be to somehow let python accept for groceries an input for groceries, like

locations = {'banana': 1, 'steak': 5, 'water': 9, 'cheese': 4, 'spam': 2, 'pizza': 8}

groceries = input ('What would you like to buy? ')

then you enter your list and it returns the entered items arranged from isle 1-10.