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NDB is an experimental, innovative, and rapidly changing new feature for App Engine. Unfortunately, being on the bleeding edge means that we may make backwards-incompatible changes to NDB. We will inform the community when this feature is no longer experimental.
A Future
represents the result of an
asynchronous operation.
When created, it probably doesn't have any result data.
When the operation finishes, the Future
gets the result.
An application can call a Future
object's
get_result()
method; if the result has arrived, the
method returns it; otherwise, it waits for the result to arrive and
then returns it.
None
if there was no problem.
True
if the result (or exception) has arrived;
otherwise, returns False
. This function does not wait.
None
if
there was no exception). Returns the exception, doesn't raise it.
None
if there was no traceback object).
Python's
traceback
module has functions to print and work with
traceback objects.
None
.
Futures
in the passed list are done.
Arguments
Future
objects.
Returns None
.
Futures
is done.
Arguments
Future
objects.
Returns one Future
that is done.
(Returns None
if the futures
list is empty.)