Check out example codes for "how many rows affected in sqllite". It will help you in understanding the concepts better.

Code Example 1

After calling your Cursor.execute*() methods with your UPDATE or INSERT statements you can use Cursor.rowcount to see the # of rows affected by the execute call.

If I had to guess I would say the python lib is calling int sqlite3_changes(sqlite3*) from the C API but I have not looked at the code so I can't say for sure.

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