Build a CSV Summary Report (Python)

Turn raw CSV data into a summary report with Python’s csv module - parse rows, aggregate, group, and format - all runnable in your browser from an embedded sample.

1. Parsing the CSV Read an embedded CSV sample into a list of dicts with the csv module's DictReader.
2. Totals and Counts Convert the amount column to numbers and compute sum, count, min, max, and average.
3. Grouping with a Dict Group rows by a category column and total each group using collections.defaultdict.
4. Formatting the Report Assemble the totals and per-group breakdown into one aligned text report, then run it on a real file.