Can you explain what atomicity means in the context of database transactions?

Atomicity in the context of database transactions means that a transaction is executed as a single indivisible action: either all operations within the transaction are successfully completed, or none of them are applied.

This guarantees that in case of a failure or error, the database will not remain in an intermediate, inconsistent state. For example, when transferring money between accounts, the debit from one account and the credit to another should happen together or not at all.

In Python, when working with databases, atomicity is usually ensured through a transaction mechanism, where after performing operations, commit() is called to save changes or rollback() to undo all changes in case of an error.