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Name	Size	Permission	Date
2to3.rst	16.15 KB	-rw-r--r--	2024-03-19 22:46
__future__.rst	6 KB	-rw-r--r--	2024-03-19 22:46
__main__.rst	12.34 KB	-rw-r--r--	2024-03-19 22:46
_thread.rst	7.88 KB	-rw-r--r--	2024-03-19 22:46
abc.rst	12.19 KB	-rw-r--r--	2024-03-19 22:46
aifc.rst	7.48 KB	-rw-r--r--	2024-03-19 22:46
allos.rst	678 B	-rw-r--r--	2024-03-19 22:46
archiving.rst	440 B	-rw-r--r--	2024-03-19 22:46
argparse.rst	80.31 KB	-rw-r--r--	2024-03-19 22:46
array.rst	10.45 KB	-rw-r--r--	2024-03-19 22:46
ast.rst	75.95 KB	-rw-r--r--	2024-03-19 22:46
asynchat.rst	8.44 KB	-rw-r--r--	2024-03-19 22:46
asyncio-api-index.rst	4.61 KB	-rw-r--r--	2024-03-19 22:46
asyncio-dev.rst	7.31 KB	-rw-r--r--	2024-03-19 22:46
asyncio-eventloop.rst	59.33 KB	-rw-r--r--	2024-03-19 22:46
asyncio-exceptions.rst	1.7 KB	-rw-r--r--	2024-03-19 22:46
asyncio-future.rst	8.31 KB	-rw-r--r--	2024-03-19 22:46
asyncio-llapi-index.rst	14.06 KB	-rw-r--r--	2024-03-19 22:46
asyncio-platforms.rst	3.03 KB	-rw-r--r--	2024-03-19 22:46
asyncio-policy.rst	9.17 KB	-rw-r--r--	2024-03-19 22:46
asyncio-protocol.rst	31.55 KB	-rw-r--r--	2024-03-19 22:46
asyncio-queue.rst	5.5 KB	-rw-r--r--	2024-03-19 22:46
asyncio-stream.rst	14.88 KB	-rw-r--r--	2024-03-19 22:46
asyncio-subprocess.rst	11.4 KB	-rw-r--r--	2024-03-19 22:46
asyncio-sync.rst	8.84 KB	-rw-r--r--	2024-03-19 22:46
asyncio-task.rst	32.29 KB	-rw-r--r--	2024-03-19 22:46
asyncio.rst	2.63 KB	-rw-r--r--	2024-03-19 22:46
asyncore.rst	13.43 KB	-rw-r--r--	2024-03-19 22:46
atexit.rst	3.84 KB	-rw-r--r--	2024-03-19 22:46
audioop.rst	10.59 KB	-rw-r--r--	2024-03-19 22:46
audit_events.rst	2.29 KB	-rw-r--r--	2024-03-19 22:46
base64.rst	10.87 KB	-rw-r--r--	2024-03-19 22:46
bdb.rst	14.54 KB	-rw-r--r--	2024-03-19 22:46
binary.rst	654 B	-rw-r--r--	2024-03-19 22:46
binascii.rst	7.66 KB	-rw-r--r--	2024-03-19 22:46
binhex.rst	1.69 KB	-rw-r--r--	2024-03-19 22:46
bisect.rst	9.06 KB	-rw-r--r--	2024-03-19 22:46
builtins.rst	1.43 KB	-rw-r--r--	2024-03-19 22:46
bz2.rst	11.87 KB	-rw-r--r--	2024-03-19 22:46
calendar.rst	14.17 KB	-rw-r--r--	2024-03-19 22:46
cgi.rst	21.49 KB	-rw-r--r--	2024-03-19 22:46
cgitb.rst	3.75 KB	-rw-r--r--	2024-03-19 22:46
chunk.rst	5.1 KB	-rw-r--r--	2024-03-19 22:46
cmath.rst	9.42 KB	-rw-r--r--	2024-03-19 22:46
cmd.rst	13.6 KB	-rw-r--r--	2024-03-19 22:46
code.rst	7.64 KB	-rw-r--r--	2024-03-19 22:46
codecs.rst	75.37 KB	-rw-r--r--	2024-03-19 22:46
codeop.rst	3 KB	-rw-r--r--	2024-03-19 22:46
collections.abc.rst	16.73 KB	-rw-r--r--	2024-03-19 22:46
collections.rst	52.13 KB	-rw-r--r--	2024-03-19 22:46
colorsys.rst	1.77 KB	-rw-r--r--	2024-03-19 22:46
compileall.rst	13.45 KB	-rw-r--r--	2024-03-19 22:46
concurrency.rst	685 B	-rw-r--r--	2024-03-19 22:46
concurrent.futures.rst	20.76 KB	-rw-r--r--	2024-03-19 22:46
concurrent.rst	171 B	-rw-r--r--	2024-03-19 22:46
configparser.rst	49.91 KB	-rw-r--r--	2024-03-19 22:46
constants.rst	3.77 KB	-rw-r--r--	2024-03-19 22:46
contextlib.rst	34.35 KB	-rw-r--r--	2024-03-19 22:46
contextvars.rst	8.32 KB	-rw-r--r--	2024-03-19 22:46
copy.rst	3.39 KB	-rw-r--r--	2024-03-19 22:46
copyreg.rst	1.97 KB	-rw-r--r--	2024-03-19 22:46
crypt.rst	5.84 KB	-rw-r--r--	2024-03-19 22:46
crypto.rst	411 B	-rw-r--r--	2024-03-19 22:46
csv.rst	20.91 KB	-rw-r--r--	2024-03-19 22:46
ctypes.rst	90.63 KB	-rw-r--r--	2024-03-19 22:46
curses.ascii.rst	8.85 KB	-rw-r--r--	2024-03-19 22:46
curses.panel.rst	2.7 KB	-rw-r--r--	2024-03-19 22:46
curses.rst	77.03 KB	-rw-r--r--	2024-03-19 22:46
custominterp.rst	569 B	-rw-r--r--	2024-03-19 22:46
dataclasses.rst	29.22 KB	-rw-r--r--	2024-03-19 22:46
datatypes.rst	817 B	-rw-r--r--	2024-03-19 22:46
datetime.rst	101.93 KB	-rw-r--r--	2024-03-19 22:46
dbm.rst	15.05 KB	-rw-r--r--	2024-03-19 22:46
debug.rst	611 B	-rw-r--r--	2024-03-19 22:46
decimal.rst	76.21 KB	-rw-r--r--	2024-03-19 22:46
development.rst	719 B	-rw-r--r--	2024-03-19 22:46
devmode.rst	7.28 KB	-rw-r--r--	2024-03-19 22:46
dialog.rst	6.12 KB	-rw-r--r--	2024-03-19 22:46
difflib.rst	29.76 KB	-rw-r--r--	2024-03-19 22:46
dis.rst	35.33 KB	-rw-r--r--	2024-03-19 22:46
distribution.rst	452 B	-rw-r--r--	2024-03-19 22:46
distutils.rst	2.09 KB	-rw-r--r--	2024-03-19 22:46
doctest.rst	69.87 KB	-rw-r--r--	2024-03-19 22:46
email.charset.rst	7.83 KB	-rw-r--r--	2024-03-19 22:46
email.compat32-message.rst	32.89 KB	-rw-r--r--	2024-03-19 22:46
email.contentmanager.rst	8.9 KB	-rw-r--r--	2024-03-19 22:46
email.encoders.rst	2.92 KB	-rw-r--r--	2024-03-19 22:46
email.errors.rst	4.8 KB	-rw-r--r--	2024-03-19 22:46
email.examples.rst	1.87 KB	-rw-r--r--	2024-03-19 22:46
email.generator.rst	13.49 KB	-rw-r--r--	2024-03-19 22:46
email.header.rst	8.97 KB	-rw-r--r--	2024-03-19 22:46
email.headerregistry.rst	18.04 KB	-rw-r--r--	2024-03-19 22:46
email.iterators.rst	2.73 KB	-rw-r--r--	2024-03-19 22:46
email.message.rst	32.25 KB	-rw-r--r--	2024-03-19 22:46
email.mime.rst	11.45 KB	-rw-r--r--	2024-03-19 22:46
email.parser.rst	13.76 KB	-rw-r--r--	2024-03-19 22:46
email.policy.rst	26.39 KB	-rw-r--r--	2024-03-19 22:46
email.rst	6.63 KB	-rw-r--r--	2024-03-19 22:46
email.utils.rst	9.17 KB	-rw-r--r--	2024-03-19 22:46
ensurepip.rst	4.9 KB	-rw-r--r--	2024-03-19 22:46
enum.rst	35.96 KB	-rw-r--r--	2024-03-19 22:46
errno.rst	7.81 KB	-rw-r--r--	2024-03-19 22:46
exceptions.rst	29.86 KB	-rw-r--r--	2024-03-19 22:46
faulthandler.rst	6.51 KB	-rw-r--r--	2024-03-19 22:46
fcntl.rst	7.99 KB	-rw-r--r--	2024-03-19 22:46
filecmp.rst	5.89 KB	-rw-r--r--	2024-03-19 22:46
fileformats.rst	273 B	-rw-r--r--	2024-03-19 22:46
fileinput.rst	8.99 KB	-rw-r--r--	2024-03-19 22:46
filesys.rst	946 B	-rw-r--r--	2024-03-19 22:46
fnmatch.rst	3.31 KB	-rw-r--r--	2024-03-19 22:46
fractions.rst	6.2 KB	-rw-r--r--	2024-03-19 22:46
frameworks.rst	391 B	-rw-r--r--	2024-03-19 22:46
ftplib.rst	18.13 KB	-rw-r--r--	2024-03-19 22:46
functional.rst	365 B	-rw-r--r--	2024-03-19 22:46
functions.rst	84.5 KB	-rw-r--r--	2024-03-19 22:46
functools.rst	25.99 KB	-rw-r--r--	2024-03-19 22:46
gc.rst	11.16 KB	-rw-r--r--	2024-03-19 22:46
getopt.rst	6.4 KB	-rw-r--r--	2024-03-19 22:46
getpass.rst	1.84 KB	-rw-r--r--	2024-03-19 22:46
gettext.rst	27.35 KB	-rw-r--r--	2024-03-19 22:46
glob.rst	5.07 KB	-rw-r--r--	2024-03-19 22:46
graphlib.rst	8.56 KB	-rw-r--r--	2024-03-19 22:46
grp.rst	2.32 KB	-rw-r--r--	2024-03-19 22:46
gzip.rst	9.7 KB	-rw-r--r--	2024-03-19 22:46
hashlib-blake2-tree.png	10.81 KB	-rw-r--r--	2024-03-19 22:46
hashlib.rst	27.32 KB	-rw-r--r--	2024-03-19 22:46
heapq.rst	13.59 KB	-rw-r--r--	2024-03-19 22:46
hmac.rst	4.93 KB	-rw-r--r--	2024-03-19 22:46
html.entities.rst	1.31 KB	-rw-r--r--	2024-03-19 22:46
html.parser.rst	11.02 KB	-rw-r--r--	2024-03-19 22:46
html.rst	1.27 KB	-rw-r--r--	2024-03-19 22:46
http.client.rst	20.86 KB	-rw-r--r--	2024-03-19 22:46
http.cookiejar.rst	27.68 KB	-rw-r--r--	2024-03-19 22:46
http.cookies.rst	8.79 KB	-rw-r--r--	2024-03-19 22:46
http.rst	7.61 KB	-rw-r--r--	2024-03-19 22:46
http.server.rst	19.68 KB	-rw-r--r--	2024-03-19 22:46
i18n.rst	408 B	-rw-r--r--	2024-03-19 22:46
idle.rst	38.83 KB	-rw-r--r--	2024-03-19 22:46
imaplib.rst	21.42 KB	-rw-r--r--	2024-03-19 22:46
imghdr.rst	3.01 KB	-rw-r--r--	2024-03-19 22:46
imp.rst	15.15 KB	-rw-r--r--	2024-03-19 22:46
importlib.metadata.rst	12.12 KB	-rw-r--r--	2024-03-19 22:46
importlib.rst	66.95 KB	-rw-r--r--	2024-03-19 22:46
index.rst	2.37 KB	-rw-r--r--	2024-03-19 22:46
inspect.rst	59.36 KB	-rw-r--r--	2024-03-19 22:46
internet.rst	923 B	-rw-r--r--	2024-03-19 22:46
intro.rst	2.95 KB	-rw-r--r--	2024-03-19 22:46
io.rst	44.14 KB	-rw-r--r--	2024-03-19 22:46
ipaddress.rst	35.22 KB	-rw-r--r--	2024-03-19 22:46
ipc.rst	643 B	-rw-r--r--	2024-03-19 22:46
itertools.rst	42.1 KB	-rw-r--r--	2024-03-19 22:46
json.rst	28.07 KB	-rw-r--r--	2024-03-19 22:46
keyword.rst	1.12 KB	-rw-r--r--	2024-03-19 22:46
language.rst	494 B	-rw-r--r--	2024-03-19 22:46
linecache.rst	2.49 KB	-rw-r--r--	2024-03-19 22:46
locale.rst	26.03 KB	-rw-r--r--	2024-03-19 22:46
logging.config.rst	36.69 KB	-rw-r--r--	2024-03-19 22:46
logging.handlers.rst	47.53 KB	-rw-r--r--	2024-03-19 22:46
logging.rst	66.77 KB	-rw-r--r--	2024-03-19 22:46
lzma.rst	16.95 KB	-rw-r--r--	2024-03-19 22:46
mailbox.rst	61.47 KB	-rw-r--r--	2024-03-19 22:46
mailcap.rst	4.43 KB	-rw-r--r--	2024-03-19 22:46
markup.rst	679 B	-rw-r--r--	2024-03-19 22:46
marshal.rst	5.35 KB	-rw-r--r--	2024-03-19 22:46
math.rst	21.01 KB	-rw-r--r--	2024-03-19 22:46
mimetypes.rst	9.96 KB	-rw-r--r--	2024-03-19 22:46
mm.rst	331 B	-rw-r--r--	2024-03-19 22:46
mmap.rst	13.41 KB	-rw-r--r--	2024-03-19 22:46
modulefinder.rst	3.16 KB	-rw-r--r--	2024-03-19 22:46
modules.rst	381 B	-rw-r--r--	2024-03-19 22:46
msilib.rst	18.51 KB	-rw-r--r--	2024-03-19 22:46
msvcrt.rst	4.5 KB	-rw-r--r--	2024-03-19 22:46
multiprocessing.rst	108.08 KB	-rw-r--r--	2024-03-19 22:46
multiprocessing.shared_memory.rst	14.44 KB	-rw-r--r--	2024-03-19 22:46
netdata.rst	314 B	-rw-r--r--	2024-03-19 22:46
netrc.rst	3.32 KB	-rw-r--r--	2024-03-19 22:46
nis.rst	2.07 KB	-rw-r--r--	2024-03-19 22:46
nntplib.rst	21.25 KB	-rw-r--r--	2024-03-19 22:46
numbers.rst	8.09 KB	-rw-r--r--	2024-03-19 22:46
numeric.rst	696 B	-rw-r--r--	2024-03-19 22:46
operator.rst	18.84 KB	-rw-r--r--	2024-03-19 22:46
optparse.rst	75.3 KB	-rw-r--r--	2024-03-19 22:46
os.path.rst	17.4 KB	-rw-r--r--	2024-03-19 22:46
os.rst	168.21 KB	-rw-r--r--	2024-03-19 22:46
ossaudiodev.rst	17.56 KB	-rw-r--r--	2024-03-19 22:46
pathlib-inheritance.png	6.28 KB	-rw-r--r--	2024-03-19 22:46
pathlib-inheritance.svg	55.23 KB	-rw-r--r--	2024-03-19 22:46
pathlib.rst	39.66 KB	-rw-r--r--	2024-03-19 22:46
pdb.rst	20.26 KB	-rw-r--r--	2024-03-19 22:46
persistence.rst	591 B	-rw-r--r--	2024-03-19 22:46
pickle.rst	46.52 KB	-rw-r--r--	2024-03-19 22:46
pickletools.rst	3.64 KB	-rw-r--r--	2024-03-19 22:46
pipes.rst	2.72 KB	-rw-r--r--	2024-03-19 22:46
pkgutil.rst	10.26 KB	-rw-r--r--	2024-03-19 22:46
platform.rst	9.7 KB	-rw-r--r--	2024-03-19 22:46
plistlib.rst	5.32 KB	-rw-r--r--	2024-03-19 22:46
poplib.rst	8.98 KB	-rw-r--r--	2024-03-19 22:46
posix.rst	3.52 KB	-rw-r--r--	2024-03-19 22:46
pprint.rst	16.34 KB	-rw-r--r--	2024-03-19 22:46
profile.rst	29.55 KB	-rw-r--r--	2024-03-19 22:46
pty.rst	4.5 KB	-rw-r--r--	2024-03-19 22:46
pwd.rst	2.67 KB	-rw-r--r--	2024-03-19 22:46
py_compile.rst	6.52 KB	-rw-r--r--	2024-03-19 22:46
pyclbr.rst	4.45 KB	-rw-r--r--	2024-03-19 22:46
pydoc.rst	5.01 KB	-rw-r--r--	2024-03-19 22:46
pyexpat.rst	29.52 KB	-rw-r--r--	2024-03-19 22:46
python.rst	480 B	-rw-r--r--	2024-03-19 22:46
queue.rst	10 KB	-rw-r--r--	2024-03-19 22:46
quopri.rst	2.51 KB	-rw-r--r--	2024-03-19 22:46
random.rst	22.98 KB	-rw-r--r--	2024-03-19 22:46
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readline.rst	12.13 KB	-rw-r--r--	2024-03-19 22:46
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resource.rst	13 KB	-rw-r--r--	2024-03-19 22:46
rlcompleter.rst	2.24 KB	-rw-r--r--	2024-03-19 22:46
runpy.rst	8.09 KB	-rw-r--r--	2024-03-19 22:46
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security_warnings.rst	1.56 KB	-rw-r--r--	2024-03-19 22:46
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signal.rst	25.12 KB	-rw-r--r--	2024-03-19 22:46
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sqlite3.rst	66.94 KB	-rw-r--r--	2024-03-19 22:46
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stringprep.rst	4.18 KB	-rw-r--r--	2024-03-19 22:46
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subprocess.rst	57.99 KB	-rw-r--r--	2024-03-19 22:46
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telnetlib.rst	8.03 KB	-rw-r--r--	2024-03-19 22:46
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termios.rst	3.66 KB	-rw-r--r--	2024-03-19 22:46
test.rst	54.87 KB	-rw-r--r--	2024-03-19 22:46
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threading.rst	42.74 KB	-rw-r--r--	2024-03-19 22:46
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Rename

.. currentmodule:: asyncio

.. _asyncio-futures:

=======
Futures
=======

**Source code:** :source:`Lib/asyncio/futures.py`,
:source:`Lib/asyncio/base_futures.py`

-------------------------------------

*Future* objects are used to bridge **low-level callback-based code**
with high-level async/await code.

Future Functions
================

.. function:: isfuture(obj)

Return ``True`` if *obj* is either of:

* an instance of :class:`asyncio.Future`,
   * an instance of :class:`asyncio.Task`,
   * a Future-like object with a ``_asyncio_future_blocking``
     attribute.

.. versionadded:: 3.5

.. function:: ensure_future(obj, *, loop=None)

Return:

* *obj* argument as is, if *obj* is a :class:`Future`,
     a :class:`Task`, or a Future-like object (:func:`isfuture`
     is used for the test.)

* a :class:`Task` object wrapping *obj*, if *obj* is a
     coroutine (:func:`iscoroutine` is used for the test);
     in this case the coroutine will be scheduled by
     ``ensure_future()``.

* a :class:`Task` object that would await on *obj*, if *obj* is an
     awaitable (:func:`inspect.isawaitable` is used for the test.)

If *obj* is neither of the above a :exc:`TypeError` is raised.

.. important::

See also the :func:`create_task` function which is the
      preferred way for creating new Tasks.

Save a reference to the result of this function, to avoid
      a task disappearing mid-execution.

.. versionchanged:: 3.5.1
      The function accepts any :term:`awaitable` object.

.. deprecated:: 3.10
      Deprecation warning is emitted if *obj* is not a Future-like object
      and *loop* is not specified and there is no running event loop.

.. function:: wrap_future(future, *, loop=None)

Wrap a :class:`concurrent.futures.Future` object in a
   :class:`asyncio.Future` object.

.. deprecated:: 3.10
      Deprecation warning is emitted if *future* is not a Future-like object
      and *loop* is not specified and there is no running event loop.

Future Object
=============

.. class:: Future(*, loop=None)

A Future represents an eventual result of an asynchronous
   operation.  Not thread-safe.

Future is an :term:`awaitable` object.  Coroutines can await on
   Future objects until they either have a result or an exception
   set, or until they are cancelled. A Future can be awaited multiple
   times and the result is same.

Typically Futures are used to enable low-level
   callback-based code (e.g. in protocols implemented using asyncio
   :ref:`transports <asyncio-transports-protocols>`)
   to interoperate with high-level async/await code.

The rule of thumb is to never expose Future objects in user-facing
   APIs, and the recommended way to create a Future object is to call
   :meth:`loop.create_future`.  This way alternative event loop
   implementations can inject their own optimized implementations
   of a Future object.

.. versionchanged:: 3.7
      Added support for the :mod:`contextvars` module.

.. deprecated:: 3.10
      Deprecation warning is emitted if *loop* is not specified
      and there is no running event loop.

.. method:: result()

Return the result of the Future.

If the Future is *done* and has a result set by the
      :meth:`set_result` method, the result value is returned.

If the Future is *done* and has an exception set by the
      :meth:`set_exception` method, this method raises the exception.

If the Future has been *cancelled*, this method raises
      a :exc:`CancelledError` exception.

If the Future's result isn't yet available, this method raises
      a :exc:`InvalidStateError` exception.

.. method:: set_result(result)

Mark the Future as *done* and set its result.

Raises a :exc:`InvalidStateError` error if the Future is
      already *done*.

.. method:: set_exception(exception)

Mark the Future as *done* and set an exception.

Raises a :exc:`InvalidStateError` error if the Future is
      already *done*.

.. method:: done()

Return ``True`` if the Future is *done*.

A Future is *done* if it was *cancelled* or if it has a result
      or an exception set with :meth:`set_result` or
      :meth:`set_exception` calls.

.. method:: cancelled()

Return ``True`` if the Future was *cancelled*.

The method is usually used to check if a Future is not
      *cancelled* before setting a result or an exception for it::

if not fut.cancelled():
              fut.set_result(42)

.. method:: add_done_callback(callback, *, context=None)

Add a callback to be run when the Future is *done*.

The *callback* is called with the Future object as its only
      argument.

If the Future is already *done* when this method is called,
      the callback is scheduled with :meth:`loop.call_soon`.

An optional keyword-only *context* argument allows specifying a
      custom :class:`contextvars.Context` for the *callback* to run in.
      The current context is used when no *context* is provided.

:func:`functools.partial` can be used to pass parameters
      to the callback, e.g.::

# Call 'print("Future:", fut)' when "fut" is done.
          fut.add_done_callback(
              functools.partial(print, "Future:"))

.. versionchanged:: 3.7
         The *context* keyword-only parameter was added.
         See :pep:`567` for more details.

.. method:: remove_done_callback(callback)

Remove *callback* from the callbacks list.

Returns the number of callbacks removed, which is typically 1,
      unless a callback was added more than once.

.. method:: cancel(msg=None)

Cancel the Future and schedule callbacks.

If the Future is already *done* or *cancelled*, return ``False``.
      Otherwise, change the Future's state to *cancelled*,
      schedule the callbacks, and return ``True``.

.. versionchanged:: 3.9
         Added the *msg* parameter.

.. method:: exception()

Return the exception that was set on this Future.

The exception (or ``None`` if no exception was set) is
      returned only if the Future is *done*.

If the Future has been *cancelled*, this method raises a
      :exc:`CancelledError` exception.

If the Future isn't *done* yet, this method raises an
      :exc:`InvalidStateError` exception.

.. method:: get_loop()

Return the event loop the Future object is bound to.

.. versionadded:: 3.7

.. _asyncio_example_future:

This example creates a Future object, creates and schedules an
asynchronous Task to set result for the Future, and waits until
the Future has a result::

async def set_after(fut, delay, value):
        # Sleep for *delay* seconds.
        await asyncio.sleep(delay)

# Set *value* as a result of *fut* Future.
        fut.set_result(value)

async def main():
        # Get the current event loop.
        loop = asyncio.get_running_loop()

# Create a new Future object.
        fut = loop.create_future()

# Run "set_after()" coroutine in a parallel Task.
        # We are using the low-level "loop.create_task()" API here because
        # we already have a reference to the event loop at hand.
        # Otherwise we could have just used "asyncio.create_task()".
        loop.create_task(
            set_after(fut, 1, '... world'))

print('hello ...')

# Wait until *fut* has a result (1 second) and print it.
        print(await fut)

asyncio.run(main())

.. important::

The Future object was designed to mimic
   :class:`concurrent.futures.Future`.  Key differences include:

- unlike asyncio Futures, :class:`concurrent.futures.Future`
     instances cannot be awaited.

- :meth:`asyncio.Future.result` and :meth:`asyncio.Future.exception`
     do not accept the *timeout* argument.

- :meth:`asyncio.Future.result` and :meth:`asyncio.Future.exception`
     raise an :exc:`InvalidStateError` exception when the Future is not
     *done*.

- Callbacks registered with :meth:`asyncio.Future.add_done_callback`
     are not called immediately.  They are scheduled with
     :meth:`loop.call_soon` instead.

- asyncio Future is not compatible with the
     :func:`concurrent.futures.wait` and
     :func:`concurrent.futures.as_completed` functions.

- :meth:`asyncio.Future.cancel` accepts an optional ``msg`` argument,
     but :func:`concurrent.futures.cancel` does not.