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NDB Future Class | App Engine standard environment for Python 2

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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.

Note: There is no 1:1 mapping between RPCs and Futures. Multiple futures might be tied to a result from a single RPC.

check_success()

Check to see if the operation succeeded. Waits if necessary. Raises an exception if there was a problem; returns None if there was no problem.

done()

Returns True if the result (or exception) has arrived; otherwise, returns False. This function does not wait.

get_exception()

Waits if necessary; then returns the exception (or None if there was no exception). Returns the exception, doesn't raise it.

get_result()

Waits if necessary; then returns the result or raises the exception.

get_traceback()

Waits if necessary; then returns the exception's traceback object (or None if there was no traceback object). Python's traceback module has functions to print and work with traceback objects.

wait()

Waits until a result or exception arrives. Always returns None.

wait_all(futures)

Wait until all Futures in the passed iterable are done.

Arguments

futures

Iterable of Future objects.

Returns None.

wait_any(futures)

Wait until at least one of a iterable of Futures is done.

Arguments

futures

Iterable of Future objects.

Returns one Future that is done. (Returns None if the futures iterable is empty.)

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Last updated 2025-08-07 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["This page outlines how to utilize legacy bundled services and APIs, which are exclusive to first-generation runtimes within the App Engine standard environment."],["A `Future` object represents the outcome of an asynchronous operation and stores the result once the operation is complete."],["The `Future` object includes methods like `get_result()` to retrieve the result, `check_success()` to confirm the operation's success, and `done()` to check if the operation has finished."],["`wait_all` and `wait_any` are class methods that allow you to wait for multiple `Futures` to complete, either waiting for all to finish or waiting until at least one is done."]]],[]]

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