promos = [fidelity_promo, bulk_item_promo, large_order_promo]
def best_promo(order):
"""Select best discount available
"""
return max(promo(order) for promo in promos)
Is straightforward: promos is a list of functions. Once you get used to the idea that functions are first class objects, it naturally follows that building data structures holding functions often makes sense.
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