google.appengine.api.datastore.RunInTransaction

Runs a function inside a datastore transaction.

google.appengine.api.datastore.RunInTransaction(
    function, *args, **kwargs
)

Runs the user-provided function inside transaction, retries default number of times.

Args: function: a function to be run inside the transaction on all remaining arguments *args: positional arguments for function. **kwargs: keyword arguments for function.

Returns
the function's return value, if any

Raises
TransactionFailedError, if the transaction could not be committed.