Market Basket Support

Problem

Compute the support of an item: the fraction of baskets containing it.

Empty input returns 0.0.

Hint

Support is the popularity of an itemset across baskets.

case 1

in: [[["milk","bread"],["milk"],["eggs","bread"],["milk","eggs"]],"milk"]

expected: 0.75

case 2

in: [[["milk","bread"],["milk"],["eggs","bread"],["milk","eggs"]],"bread"]

expected: 0.5

case 3

in: [[["milk","bread"],["milk"],["eggs","bread"],["milk","eggs"]],"none"]

expected: 0

case 4

in: [[],"milk"]

expected: 0

Starter codePython

def basket_support(baskets, item):
    # Your code here
    pass

4 test cases · run your code against them in the editor