Writing to files is an essential Python skill. It lets you save data permanently instead of losing it when your program stops. You can use file saving to store results, logs, reports, user input, ...
python 02_csv_diff_tool.py old.csv new.csv --key id --output diff_report.csv python 02_csv_diff_tool.py old.csv new.csv --key region,sku --output diff_report.csv ...
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