Notice: Over the next few months, we're reorganizing the App Engine documentation site to make it easier to find content and better align with the rest of Google Cloud products. The same content will be available, but the navigation will now match the rest of the Cloud products.

Python 3.10 is now generally available.

google.appengine.api.datastore.RunInReadOnlyTransactionOptions

Runs a function inside a read-only datastore transaction.

A read-only transaction cannot perform writes, but may be able to execute more efficiently.

Like RunInTransactionOptions, but with a read-only transaction.

options TransactionOptions specifying options (number of retries, etc) for this transaction
function a function to be run inside the transaction on all remaining arguments *args: positional arguments for function. **kwargs: keyword arguments for function.

the function's return value, if any

TransactionFailedError, if the transaction could not be committed.