JuniorTheoryCommon

What does this program print?

Python

baskets = [
    {"tea", "sugar"},
    {"tea", "lemon", "sugar"},
    {"coffee", "sugar"},
    {"tea", "lemon"},
]
itemset = {"tea", "sugar"}
count = sum(1 for b in baskets if itemset <= b)
print(count / len(baskets))

0.5

Expecting 1.0: on sets <= is the subset test, not a size comparison, so a basket counts only if it holds both tea and sugar.
Expecting 0.25: <= lets a basket hold extra items, so the basket with lemon counts as well; only == demands an exact match.

What would the program print with == in place of <=?
How would the support change if a fifth basket held only tea?

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JuniorTheoryCommon

What does this program print?

Python

baskets = [
    {"tea", "sugar"},
    {"tea", "lemon", "sugar"},
    {"coffee", "sugar"},
    {"tea", "lemon"},
]
itemset = {"tea", "sugar"}
count = sum(1 for b in baskets if itemset <= b)
print(count / len(baskets))

0.5

Expecting 1.0: on sets <= is the subset test, not a size comparison, so a basket counts only if it holds both tea and sugar.
Expecting 0.25: <= lets a basket hold extra items, so the basket with lemon counts as well; only == demands an exact match.

What would the program print with == in place of <=?
How would the support change if a fifth basket held only tea?

Back to questions Open topic in roadmap →Answer it yourself — Quiz