Description

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Intermediate · 16 min

Project: expense report

Combine structured data, filtering, sorting, and reusable functions.

Summarize records

Keep calculation code in a function so the same rule works for any list of records.

def total(items):
    return sum(item["amount"] for item in items)

expenses = [{"amount": 8}, {"amount": 12}]
print(total(expenses))

Output

20

Filter before sorting

A comprehension can select records before sorted() orders them by a chosen key.

items = [{"name": "Train", "amount": 18}, {"name": "Tea", "amount": 3}]
large = [item for item in items if item["amount"] >= 10]
print([item["name"] for item in large])

Output

['Train']

Project: expense report

  1. Read both project: expense report examples before answering.
  2. Run the task, compare its exact output, and revise the code if needed.

Try it yourself

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Build the report

Complete report so it returns the total and the names of expenses costing at least 10, ordered from highest amount to lowest. Display the supplied summary.

Practice