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Week 7: Data Processing Patterns

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Course: Jan 2026 - Python Focus: Recognizing filter/map/aggregate patterns in compact code.

1. Core idea

Week 7 is about reading one expression and seeing the data pipeline hidden inside it.

What to remember

  • Filtering keeps only some items.
  • Mapping transforms each item.
  • Aggregation combines many items into one output.
  • Generator expressions often feed into sum, join, or next.
  • List comprehensions can combine filtering and mapping.

2. Common traps

  • A single expression can contain more than one pattern.
  • sum(...) means aggregation, even if the inner part filters or maps.
  • join(...) is aggregation over strings.
  • next(...) means "take the first matching value."

3. Speedrun pattern

When you see a Week 7 question, ask:
  1. What gets removed?
  2. What gets transformed?
  3. What is the final collector doing?

4. Micro revision

  • Filter = select
  • Map = transform
  • Aggregate = combine

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