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#: ../../library/asyncio-future.rst:8
msgid "Futures"
msgstr ""

#: ../../library/asyncio-future.rst:10
msgid ""
"**Source code:** :source:`Lib/asyncio/futures.py`, :source:`Lib/asyncio/"
"base_futures.py`"
msgstr ""

#: ../../library/asyncio-future.rst:15
msgid ""
"*Future* objects are used to bridge **low-level callback-based code** with "
"high-level async/await code."
msgstr ""

#: ../../library/asyncio-future.rst:20
msgid "Future Functions"
msgstr ""

#: ../../library/asyncio-future.rst:24
msgid "Return ``True`` if *obj* is either of:"
msgstr ""

#: ../../library/asyncio-future.rst:26
msgid "an instance of :class:`asyncio.Future`,"
msgstr ""

#: ../../library/asyncio-future.rst:27
msgid "an instance of :class:`asyncio.Task`,"
msgstr ""

#: ../../library/asyncio-future.rst:28
msgid "a Future-like object with a ``_asyncio_future_blocking`` attribute."
msgstr ""

#: ../../library/asyncio-future.rst:36
msgid "Return:"
msgstr ""

#: ../../library/asyncio-future.rst:38
msgid ""
"*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.)"
msgstr ""

#: ../../library/asyncio-future.rst:42
msgid ""
"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()``."
msgstr ""

#: ../../library/asyncio-future.rst:47
msgid ""
"a :class:`Task` object that would await on *obj*, if *obj* is an awaitable (:"
"func:`inspect.isawaitable` is used for the test.)"
msgstr ""

#: ../../library/asyncio-future.rst:50
msgid "If *obj* is neither of the above a :exc:`TypeError` is raised."
msgstr ""

#: ../../library/asyncio-future.rst:54
msgid ""
"Save a reference to the result of this function, to avoid a task "
"disappearing mid-execution."
msgstr ""

#: ../../library/asyncio-future.rst:57
msgid ""
"See also the :func:`create_task` function which is the preferred way for "
"creating new tasks or use :class:`asyncio.TaskGroup` which keeps reference "
"to the task internally."
msgstr ""

#: ../../library/asyncio-future.rst:61
msgid "The function accepts any :term:`awaitable` object."
msgstr ""

#: ../../library/asyncio-future.rst:64
msgid ""
"Deprecation warning is emitted if *obj* is not a Future-like object and "
"*loop* is not specified and there is no running event loop."
msgstr ""

#: ../../library/asyncio-future.rst:71
msgid ""
"Wrap a :class:`concurrent.futures.Future` object in a :class:`asyncio."
"Future` object."
msgstr ""

#: ../../library/asyncio-future.rst:74
msgid ""
"Deprecation warning is emitted if *future* is not a Future-like object and "
"*loop* is not specified and there is no running event loop."
msgstr ""

#: ../../library/asyncio-future.rst:81
msgid "Future Object"
msgstr ""

#: ../../library/asyncio-future.rst:85
msgid ""
"A Future represents an eventual result of an asynchronous operation.  Not "
"thread-safe."
msgstr ""

#: ../../library/asyncio-future.rst:88
msgid ""
"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."
msgstr ""

#: ../../library/asyncio-future.rst:93
msgid ""
"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."
msgstr ""

#: ../../library/asyncio-future.rst:98
msgid ""
"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."
msgstr ""

#: ../../library/asyncio-future.rst:104
msgid "Futures are :ref:`generic <generics>` over the type of their results."
msgstr ""

#: ../../library/asyncio-future.rst:106
msgid "Added support for the :mod:`contextvars` module."
msgstr ""

#: ../../library/asyncio-future.rst:109
msgid ""
"Deprecation warning is emitted if *loop* is not specified and there is no "
"running event loop."
msgstr ""

#: ../../library/asyncio-future.rst:115
msgid "Return the result of the Future."
msgstr ""

#: ../../library/asyncio-future.rst:117
msgid ""
"If the Future is *done* and has a result set by the :meth:`set_result` "
"method, the result value is returned."
msgstr ""

#: ../../library/asyncio-future.rst:120
msgid ""
"If the Future is *done* and has an exception set by the :meth:"
"`set_exception` method, this method raises the exception."
msgstr ""

#: ../../library/asyncio-future.rst:123 ../../library/asyncio-future.rst:215
msgid ""
"If the Future has been *cancelled*, this method raises a :exc:"
"`CancelledError` exception."
msgstr ""

#: ../../library/asyncio-future.rst:126
msgid ""
"If the Future's result isn't yet available, this method raises an :exc:"
"`InvalidStateError` exception."
msgstr ""

#: ../../library/asyncio-future.rst:131
msgid "Mark the Future as *done* and set its result."
msgstr ""

#: ../../library/asyncio-future.rst:133 ../../library/asyncio-future.rst:140
msgid ""
"Raises an :exc:`InvalidStateError` error if the Future is already *done*."
msgstr ""

#: ../../library/asyncio-future.rst:138
msgid "Mark the Future as *done* and set an exception."
msgstr ""

#: ../../library/asyncio-future.rst:145
msgid "Return ``True`` if the Future is *done*."
msgstr ""

#: ../../library/asyncio-future.rst:147
msgid ""
"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."
msgstr ""

#: ../../library/asyncio-future.rst:153
msgid "Return ``True`` if the Future was *cancelled*."
msgstr ""

#: ../../library/asyncio-future.rst:155
msgid ""
"The method is usually used to check if a Future is not *cancelled* before "
"setting a result or an exception for it::"
msgstr ""

#: ../../library/asyncio-future.rst:158
msgid ""
"if not fut.cancelled():\n"
"    fut.set_result(42)"
msgstr ""

#: ../../library/asyncio-future.rst:163
msgid "Add a callback to be run when the Future is *done*."
msgstr ""

#: ../../library/asyncio-future.rst:165
msgid "The *callback* is called with the Future object as its only argument."
msgstr ""

#: ../../library/asyncio-future.rst:168
msgid ""
"If the Future is already *done* when this method is called, the callback is "
"scheduled with :meth:`loop.call_soon`."
msgstr ""

#: ../../library/asyncio-future.rst:171
msgid ""
"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."
msgstr ""

#: ../../library/asyncio-future.rst:175
msgid ""
":func:`functools.partial` can be used to pass parameters to the callback, e."
"g.::"
msgstr ""

#: ../../library/asyncio-future.rst:178
msgid ""
"# Call 'print(\"Future:\", fut)' when \"fut\" is done.\n"
"fut.add_done_callback(\n"
"    functools.partial(print, \"Future:\"))"
msgstr ""

#: ../../library/asyncio-future.rst:182
msgid ""
"The *context* keyword-only parameter was added. See :pep:`567` for more "
"details."
msgstr ""

#: ../../library/asyncio-future.rst:188
msgid "Remove *callback* from the callbacks list."
msgstr ""

#: ../../library/asyncio-future.rst:190
msgid ""
"Returns the number of callbacks removed, which is typically 1, unless a "
"callback was added more than once."
msgstr ""

#: ../../library/asyncio-future.rst:195
msgid "Cancel the Future and schedule callbacks."
msgstr ""

#: ../../library/asyncio-future.rst:197
msgid ""
"If the Future is already *done* or *cancelled*, return ``False``. Otherwise, "
"change the Future's state to *cancelled*, schedule the callbacks, and return "
"``True``."
msgstr ""

#: ../../library/asyncio-future.rst:201
msgid ""
"The optional string argument *msg* is passed as the argument to the :exc:"
"`CancelledError` exception raised when a cancelled Future is awaited."
msgstr ""

#: ../../library/asyncio-future.rst:205
msgid "Added the *msg* parameter."
msgstr ""

#: ../../library/asyncio-future.rst:210
msgid "Return the exception that was set on this Future."
msgstr ""

#: ../../library/asyncio-future.rst:212
msgid ""
"The exception (or ``None`` if no exception was set) is returned only if the "
"Future is *done*."
msgstr ""

#: ../../library/asyncio-future.rst:218
msgid ""
"If the Future isn't *done* yet, this method raises an :exc:"
"`InvalidStateError` exception."
msgstr ""

#: ../../library/asyncio-future.rst:223
msgid "Return the event loop the Future object is bound to."
msgstr ""

#: ../../library/asyncio-future.rst:230
msgid ""
"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::"
msgstr ""

#: ../../library/asyncio-future.rst:234
msgid ""
"async def set_after(fut, delay, value):\n"
"    # Sleep for *delay* seconds.\n"
"    await asyncio.sleep(delay)\n"
"\n"
"    # Set *value* as a result of *fut* Future.\n"
"    fut.set_result(value)\n"
"\n"
"async def main():\n"
"    # Get the current event loop.\n"
"    loop = asyncio.get_running_loop()\n"
"\n"
"    # Create a new Future object.\n"
"    fut = loop.create_future()\n"
"\n"
"    # Run \"set_after()\" coroutine in a parallel Task.\n"
"    # We are using the low-level \"loop.create_task()\" API here because\n"
"    # we already have a reference to the event loop at hand.\n"
"    # Otherwise we could have just used \"asyncio.create_task()\".\n"
"    loop.create_task(\n"
"        set_after(fut, 1, '... world'))\n"
"\n"
"    print('hello ...')\n"
"\n"
"    # Wait until *fut* has a result (1 second) and print it.\n"
"    print(await fut)\n"
"\n"
"asyncio.run(main())"
msgstr ""

#: ../../library/asyncio-future.rst:265
msgid ""
"The Future object was designed to mimic :class:`concurrent.futures.Future`.  "
"Key differences include:"
msgstr ""

#: ../../library/asyncio-future.rst:268
msgid ""
"unlike asyncio Futures, :class:`concurrent.futures.Future` instances cannot "
"be awaited."
msgstr ""

#: ../../library/asyncio-future.rst:271
msgid ""
":meth:`asyncio.Future.result` and :meth:`asyncio.Future.exception` do not "
"accept the *timeout* argument."
msgstr ""

#: ../../library/asyncio-future.rst:274
msgid ""
":meth:`asyncio.Future.result` and :meth:`asyncio.Future.exception` raise an :"
"exc:`InvalidStateError` exception when the Future is not *done*."
msgstr ""

#: ../../library/asyncio-future.rst:278
msgid ""
"Callbacks registered with :meth:`asyncio.Future.add_done_callback` are not "
"called immediately.  They are scheduled with :meth:`loop.call_soon` instead."
msgstr ""

#: ../../library/asyncio-future.rst:282
msgid ""
"asyncio Future is not compatible with the :func:`concurrent.futures.wait` "
"and :func:`concurrent.futures.as_completed` functions."
msgstr ""

#: ../../library/asyncio-future.rst:286
msgid ""
":meth:`asyncio.Future.cancel` accepts an optional ``msg`` argument, but :"
"meth:`concurrent.futures.Future.cancel` does not."
msgstr ""