# 'write' mode is intended to fill the new CSV file (i.e. blank file) with data. If you use 'w' mode on a CSV file that contains some data, its contents will be overwritten. # you can use csv.writer ...
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 ...