Convert a repeated membership scan into a set or dictionary design when appropriate.
The slow scan A reconciliation loop checks whether each invoice ID appears in a paid-ID list. The paid-ID list is scanned again for every invoice. The work shape is multiplying two files. Membership diagnosis Question -> Contract -> Index First name the question the code asks. If it asks membership, use a set. If it asks key-to-value, use a dictionary. Scan Ask the whole list every time The loop pays one indexing pass instead of repeated scans. A set is the right contract when uniqueness and membership matter more than order. 01 Question 02 Contract 03 Index Decision 1 For…
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