question 276 Data Models & Typing · medium

SKUs that won't go into a set

SKU codes are typed by hand, so Sku compares them ignoring case and outer spaces: Sku("spo-11681 ") == Sku("SPO-11681"). Deduplicating a list with set(...) now crashes with TypeError: unhashable type: 'Sku'. Make Sku hashable in a way that agrees with its equality, so equal SKUs collapse to one.

Equalitytwo Skus are equal when their codes match after strip().upper() (keep this)

Fixa __hash__ that agrees with __eq__: equal Skus must have equal hashes

Thenunique_skus(skus) (given) returns the distinct codes, sorted