python-docs-pl/library/asyncio-task.po at 3.8 · python/python-docs-pl

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# Copyright (C) 2001-2021, Python Software Foundation
# This file is distributed under the same license as the Python package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
# Translators:
# Maciej Olko <maciej.olko@gmail.com>, 2020
"Project-Id-Version: Python 3.8\n"
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"PO-Revision-Date: 2020-05-30 11:56+0000\n"
"Last-Translator: Maciej Olko <maciej.olko@gmail.com>, 2020\n"
"Language-Team: Polish (https://www.transifex.com/python-doc/teams/5390/pl/)\n"
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msgid "Coroutines and Tasks"
"This section outlines high-level asyncio APIs to work with coroutines and "
msgid "Coroutines"
":term:`Coroutines <coroutine>` declared with the async/await syntax is the "
"preferred way of writing asyncio applications.  For example, the following "
"snippet of code (requires Python 3.7+) prints \"hello\", waits 1 second, and "
"then prints \"world\"::"
"Note that simply calling a coroutine will not schedule it to be executed::"
msgid "To actually run a coroutine, asyncio provides three main mechanisms:"
"The :func:`asyncio.run` function to run the top-level entry point \"main()\" "
"function (see the above example.)"
"Awaiting on a coroutine.  The following snippet of code will print \"hello\" "
"after waiting for 1 second, and then print \"world\" after waiting for "
"*another* 2 seconds::"
msgid "Expected output::"
"The :func:`asyncio.create_task` function to run coroutines concurrently as "
"asyncio :class:`Tasks <Task>`."
"Let's modify the above example and run two ``say_after`` coroutines "
"*concurrently*::"
"Note that expected output now shows that the snippet runs 1 second faster "
"than before::"
msgid "Awaitables"
"We say that an object is an **awaitable** object if it can be used in an :"
"keyword:`await` expression.  Many asyncio APIs are designed to accept "
"awaitables."
"There are three main types of *awaitable* objects: **coroutines**, "
"**Tasks**, and **Futures**."
"Python coroutines are *awaitables* and therefore can be awaited from other "
"coroutines::"
"In this documentation the term \"coroutine\" can be used for two closely "
"related concepts:"
msgid "a *coroutine function*: an :keyword:`async def` function;"
"a *coroutine object*: an object returned by calling a *coroutine function*."
"asyncio also supports legacy :ref:`generator-based "
"<asyncio_generator_based_coro>` coroutines."
msgid "Tasks"
msgid "*Tasks* are used to schedule coroutines *concurrently*."
"When a coroutine is wrapped into a *Task* with functions like :func:`asyncio."
"create_task` the coroutine is automatically scheduled to run soon::"
msgid "Futures"
"A :class:`Future` is a special **low-level** awaitable object that "
"represents an **eventual result** of an asynchronous operation."
"When a Future object is *awaited* it means that the coroutine will wait "
"until the Future is resolved in some other place."
"Future objects in asyncio are needed to allow callback-based code to be used "
"with async/await."
"Normally **there is no need** to create Future objects at the application "
"level code."
"Future objects, sometimes exposed by libraries and some asyncio APIs, can be "
"awaited::"
"A good example of a low-level function that returns a Future object is :meth:"
"`loop.run_in_executor`."
msgid "Running an asyncio Program"
msgid "Execute the :term:`coroutine` *coro* and return the result."
"This function runs the passed coroutine, taking care of managing the asyncio "
"event loop and *finalizing asynchronous generators*."
"This function cannot be called when another asyncio event loop is running in "
"the same thread."
msgid "If *debug* is ``True``, the event loop will be run in debug mode."
"This function always creates a new event loop and closes it at the end.  It "
"should be used as a main entry point for asyncio programs, and should "
"ideally only be called once."
msgid "Example::"
"The source code for ``asyncio.run()`` can be found in :source:`Lib/asyncio/"
"runners.py`."
msgid "Creating Tasks"
"Wrap the *coro* :ref:`coroutine <coroutine>` into a :class:`Task` and "
"schedule its execution.  Return the Task object."
"If *name* is not ``None``, it is set as the name of the task using :meth:"
"`Task.set_name`."
"The task is executed in the loop returned by :func:`get_running_loop`, :exc:"
"`RuntimeError` is raised if there is no running loop in current thread."
"This function has been **added in Python 3.7**.  Prior to Python 3.7, the "
"low-level :func:`asyncio.ensure_future` function can be used instead::"
msgid "Added the ``name`` parameter."
msgid "Sleeping"
msgid "Block for *delay* seconds."
"If *result* is provided, it is returned to the caller when the coroutine "
"completes."
"``sleep()`` always suspends the current task, allowing other tasks to run."
msgid "The *loop* parameter."
"Example of coroutine displaying the current date every second for 5 seconds::"
msgid "Running Tasks Concurrently"
"Run :ref:`awaitable objects <asyncio-awaitables>` in the *aws* sequence "
"*concurrently*."
"If any awaitable in *aws* is a coroutine, it is automatically scheduled as a "
"If all awaitables are completed successfully, the result is an aggregate "
"list of returned values.  The order of result values corresponds to the "
"order of awaitables in *aws*."
"If *return_exceptions* is ``False`` (default), the first raised exception is "
"immediately propagated to the task that awaits on ``gather()``.  Other "
"awaitables in the *aws* sequence **won't be cancelled** and will continue to "
"If *return_exceptions* is ``True``, exceptions are treated the same as "
"successful results, and aggregated in the result list."
"If ``gather()`` is *cancelled*, all submitted awaitables (that have not "
"completed yet) are also *cancelled*."
"If any Task or Future from the *aws* sequence is *cancelled*, it is treated "
"as if it raised :exc:`CancelledError` -- the ``gather()`` call is **not** "
"cancelled in this case.  This is to prevent the cancellation of one "
"submitted Task/Future to cause other Tasks/Futures to be cancelled."
"If *return_exceptions* is False, cancelling gather() after it has been "
"marked done won't cancel any submitted awaitables. For instance, gather can "
"be marked done after propagating an exception to the caller, therefore, "
"calling ``gather.cancel()`` after catching an exception (raised by one of "
"the awaitables) from gather won't cancel any other awaitables."
"If the *gather* itself is cancelled, the cancellation is propagated "
"regardless of *return_exceptions*."
msgid "Shielding From Cancellation"
"Protect an :ref:`awaitable object <asyncio-awaitables>` from being :meth:"
"`cancelled <Task.cancel>`."
msgid "If *aw* is a coroutine it is automatically scheduled as a Task."
msgid "The statement::"
msgid "is equivalent to::"
"*except* that if the coroutine containing it is cancelled, the Task running "
"in ``something()`` is not cancelled.  From the point of view of "
"``something()``, the cancellation did not happen. Although its caller is "
"still cancelled, so the \"await\" expression still raises a :exc:"
"`CancelledError`."
"If ``something()`` is cancelled by other means (i.e. from within itself) "
"that would also cancel ``shield()``."
"If it is desired to completely ignore cancellation (not recommended) the "
"``shield()`` function should be combined with a try/except clause, as "
"follows::"
msgid "Timeouts"
"Wait for the *aw* :ref:`awaitable <asyncio-awaitables>` to complete with a "
"*timeout* can either be ``None`` or a float or int number of seconds to wait "
"for.  If *timeout* is ``None``, block until the future completes."
"If a timeout occurs, it cancels the task and raises :exc:`asyncio."
"TimeoutError`."
"To avoid the task :meth:`cancellation <Task.cancel>`, wrap it in :func:"
"`shield`."
"The function will wait until the future is actually cancelled, so the total "
"wait time may exceed the *timeout*."
msgid "If the wait is cancelled, the future *aw* is also cancelled."
"When *aw* is cancelled due to a timeout, ``wait_for`` waits for *aw* to be "
"cancelled.  Previously, it raised :exc:`asyncio.TimeoutError` immediately."
msgid "Waiting Primitives"
"Run :ref:`awaitable objects <asyncio-awaitables>` in the *aws* iterable "
"concurrently and block until the condition specified by *return_when*."
msgid "Returns two sets of Tasks/Futures: ``(done, pending)``."
msgid "Usage::"
"*timeout* (a float or int), if specified, can be used to control the maximum "
"number of seconds to wait before returning."
"Note that this function does not raise :exc:`asyncio.TimeoutError`. Futures "
"or Tasks that aren't done when the timeout occurs are simply returned in the "
"second set."
"*return_when* indicates when this function should return.  It must be one of "
"the following constants:"
msgid "Constant"
msgstr "Stała"
msgid "Description"
msgstr "Opis"
msgid ":const:`FIRST_COMPLETED`"
msgid "The function will return when any future finishes or is cancelled."
msgid ":const:`FIRST_EXCEPTION`"
"The function will return when any future finishes by raising an exception.  "
"If no future raises an exception then it is equivalent to :const:"
"`ALL_COMPLETED`."
msgid ":const:`ALL_COMPLETED`"
msgid "The function will return when all futures finish or are cancelled."
"Unlike :func:`~asyncio.wait_for`, ``wait()`` does not cancel the futures "
"when a timeout occurs."
"If any awaitable in *aws* is a coroutine, it is automatically scheduled as a "
"Task.  Passing coroutines objects to ``wait()`` directly is deprecated as it "
"leads to :ref:`confusing behavior <asyncio_example_wait_coroutine>`."
"``wait()`` schedules coroutines as Tasks automatically and later returns "
"those implicitly created Task objects in ``(done, pending)`` sets.  "
"Therefore the following code won't work as expected::"
msgid "Here is how the above snippet can be fixed::"
msgid "Passing coroutine objects to ``wait()`` directly is deprecated."
"Run :ref:`awaitable objects <asyncio-awaitables>` in the *aws* iterable "
"concurrently.  Return an iterator of coroutines. Each coroutine returned can "
"be awaited to get the earliest next result from the iterable of the "
"remaining awaitables."
"Raises :exc:`asyncio.TimeoutError` if the timeout occurs before all Futures "
"are done."
msgid "Scheduling From Other Threads"
msgid "Submit a coroutine to the given event loop.  Thread-safe."
"Return a :class:`concurrent.futures.Future` to wait for the result from "
"another OS thread."
"This function is meant to be called from a different OS thread than the one "
"where the event loop is running.  Example::"
"If an exception is raised in the coroutine, the returned Future will be "
"notified.  It can also be used to cancel the task in the event loop::"
"See the :ref:`concurrency and multithreading <asyncio-multithreading>` "
"section of the documentation."
"Unlike other asyncio functions this function requires the *loop* argument to "
"be passed explicitly."
msgid "Introspection"
"Return the currently running :class:`Task` instance, or ``None`` if no task "
"is running."
"If *loop* is ``None`` :func:`get_running_loop` is used to get the current "
msgid "Return a set of not yet finished :class:`Task` objects run by the loop."
"If *loop* is ``None``, :func:`get_running_loop` is used for getting current "
msgid "Task Object"
"A :class:`Future-like <Future>` object that runs a Python :ref:`coroutine "
"<coroutine>`.  Not thread-safe."
"Tasks are used to run coroutines in event loops. If a coroutine awaits on a "
"Future, the Task suspends the execution of the coroutine and waits for the "
"completion of the Future.  When the Future is *done*, the execution of the "
"wrapped coroutine resumes."
"Event loops use cooperative scheduling: an event loop runs one Task at a "
"time.  While a Task awaits for the completion of a Future, the event loop "
"runs other Tasks, callbacks, or performs IO operations."
"Use the high-level :func:`asyncio.create_task` function to create Tasks, or "
"the low-level :meth:`loop.create_task` or :func:`ensure_future` functions.  "
"Manual instantiation of Tasks is discouraged."
"To cancel a running Task use the :meth:`cancel` method.  Calling it will "
"cause the Task to throw a :exc:`CancelledError` exception into the wrapped "
"coroutine.  If a coroutine is awaiting on a Future object during "
"cancellation, the Future object will be cancelled."
":meth:`cancelled` can be used to check if the Task was cancelled. The method "
"returns ``True`` if the wrapped coroutine did not suppress the :exc:"
"`CancelledError` exception and was actually cancelled."
":class:`asyncio.Task` inherits from :class:`Future` all of its APIs except :"
"meth:`Future.set_result` and :meth:`Future.set_exception`."
"Tasks support the :mod:`contextvars` module.  When a Task is created it "
"copies the current context and later runs its coroutine in the copied "
msgid "Added support for the :mod:`contextvars` module."
msgid "Request the Task to be cancelled."
"This arranges for a :exc:`CancelledError` exception to be thrown into the "
"wrapped coroutine on the next cycle of the event loop."
"The coroutine then has a chance to clean up or even deny the request by "
"suppressing the exception with a :keyword:`try` ... ... ``except "
"CancelledError`` ... :keyword:`finally` block. Therefore, unlike :meth:"
"`Future.cancel`, :meth:`Task.cancel` does not guarantee that the Task will "
"be cancelled, although suppressing cancellation completely is not common and "
"is actively discouraged."
"The following example illustrates how coroutines can intercept the "
"cancellation request::"
msgid "Return ``True`` if the Task is *cancelled*."
"The Task is *cancelled* when the cancellation was requested with :meth:"
"`cancel` and the wrapped coroutine propagated the :exc:`CancelledError` "
"exception thrown into it."
msgid "Return ``True`` if the Task is *done*."
"A Task is *done* when the wrapped coroutine either returned a value, raised "
"an exception, or the Task was cancelled."
msgid "Return the result of the Task."
"If the Task is *done*, the result of the wrapped coroutine is returned (or "
"if the coroutine raised an exception, that exception is re-raised.)"
"If the Task has been *cancelled*, this method raises a :exc:`CancelledError` "
"exception."
"If the Task's result isn't yet available, this method raises a :exc:"
"`InvalidStateError` exception."
msgid "Return the exception of the Task."
"If the wrapped coroutine raised an exception that exception is returned.  If "
"the wrapped coroutine returned normally this method returns ``None``."
"If the Task isn't *done* yet, this method raises an :exc:`InvalidStateError` "
"exception."
msgid "Add a callback to be run when the Task is *done*."
msgid "This method should only be used in low-level callback-based code."
"See the documentation of :meth:`Future.add_done_callback` for more details."
msgid "Remove *callback* from the callbacks list."
"See the documentation of :meth:`Future.remove_done_callback` for more "
msgid "Return the list of stack frames for this Task."
"If the wrapped coroutine is not done, this returns the stack where it is "
"suspended.  If the coroutine has completed successfully or was cancelled, "
"this returns an empty list. If the coroutine was terminated by an exception, "
"this returns the list of traceback frames."
msgid "The frames are always ordered from oldest to newest."
msgid "Only one stack frame is returned for a suspended coroutine."
"The optional *limit* argument sets the maximum number of frames to return; "
"by default all available frames are returned. The ordering of the returned "
"list differs depending on whether a stack or a traceback is returned: the "
"newest frames of a stack are returned, but the oldest frames of a traceback "
"are returned.  (This matches the behavior of the traceback module.)"
msgid "Print the stack or traceback for this Task."
"This produces output similar to that of the traceback module for the frames "
"retrieved by :meth:`get_stack`."
msgid "The *limit* argument is passed to :meth:`get_stack` directly."
"The *file* argument is an I/O stream to which the output is written; by "
"default output is written to :data:`sys.stderr`."
msgid "Return the coroutine object wrapped by the :class:`Task`."
msgid "Return the name of the Task."
"If no name has been explicitly assigned to the Task, the default asyncio "
"Task implementation generates a default name during instantiation."
msgid "Set the name of the Task."
"The *value* argument can be any object, which is then converted to a string."
"In the default Task implementation, the name will be visible in the :func:"
"`repr` output of a task object."
msgid "Return a set of all tasks for an event loop."
"By default all tasks for the current event loop are returned. If *loop* is "
"``None``, the :func:`get_event_loop` function is used to get the current "
"Do not call this as a task method. Use the :func:`asyncio.all_tasks` "
"function instead."
msgid "Return the currently running task or ``None``."
"If *loop* is ``None``, the :func:`get_event_loop` function is used to get "
"the current loop."
"Do not call this as a task method.  Use the :func:`asyncio.current_task` "
"function instead."
msgid "Generator-based Coroutines"
"Support for generator-based coroutines is **deprecated** and is scheduled "
"for removal in Python 3.10."
"Generator-based coroutines predate async/await syntax.  They are Python "
"generators that use ``yield from`` expressions to await on Futures and other "
"coroutines."
"Generator-based coroutines should be decorated with :func:`@asyncio."
"coroutine <asyncio.coroutine>`, although this is not enforced."
msgid "Decorator to mark generator-based coroutines."
"This decorator enables legacy generator-based coroutines to be compatible "
"with async/await code::"
msgid "This decorator should not be used for :keyword:`async def` coroutines."
msgid "Use :keyword:`async def` instead."
msgid "Return ``True`` if *obj* is a :ref:`coroutine object <coroutine>`."
"This method is different from :func:`inspect.iscoroutine` because it returns "
"``True`` for generator-based coroutines."
msgid "Return ``True`` if *func* is a :ref:`coroutine function <coroutine>`."
"This method is different from :func:`inspect.iscoroutinefunction` because it "
"returns ``True`` for generator-based coroutine functions decorated with :"
"func:`@coroutine <coroutine>`."
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