contextvars.po

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#: library/contextvars.rst:2
msgid ":mod:`!contextvars` --- Context Variables"
msgstr ""

#: library/contextvars.rst:11
msgid ""
"This module provides APIs to manage, store, and access context-local state.  "
"The :class:`~contextvars.ContextVar` class is used to declare and work with "
"*Context Variables*.  The :func:`~contextvars.copy_context` function and "
"the :class:`~contextvars.Context` class should be used to manage the current "
"context in asynchronous frameworks."
msgstr ""

#: library/contextvars.rst:17
msgid ""
"Context managers that have state should use Context Variables instead of :"
"func:`threading.local` to prevent their state from bleeding to other code "
"unexpectedly, when used in concurrent code."
msgstr ""

#: library/contextvars.rst:21
msgid "See also :pep:`567` for additional details."
msgstr ""

#: library/contextvars.rst:27
msgid "Context Variables"
msgstr ""

#: library/contextvars.rst:31
msgid "This class is used to declare a new Context Variable, e.g.::"
msgstr ""

#: library/contextvars.rst:33
msgid "var: ContextVar[int] = ContextVar('var', default=42)"
msgstr ""

#: library/contextvars.rst:35
msgid ""
"The required *name* parameter is used for introspection and debug purposes."
msgstr ""

#: library/contextvars.rst:38
msgid ""
"The optional keyword-only *default* parameter is returned by :meth:"
"`ContextVar.get` when no value for the variable is found in the current "
"context."
msgstr ""

#: library/contextvars.rst:42
msgid ""
"**Important:** Context Variables should be created at the top module level "
"and never in closures.  :class:`Context` objects hold strong references to "
"context variables which prevents context variables from being properly "
"garbage collected."
msgstr ""

#: library/contextvars.rst:49
msgid "The name of the variable.  This is a read-only property."
msgstr ""

#: library/contextvars.rst:55
msgid "Return a value for the context variable for the current context."
msgstr ""

#: library/contextvars.rst:57
msgid ""
"If there is no value for the variable in the current context, the method "
"will:"
msgstr ""

#: library/contextvars.rst:60
msgid ""
"return the value of the *default* argument of the method, if provided; or"
msgstr ""

#: library/contextvars.rst:63
msgid ""
"return the default value for the context variable, if it was created with "
"one; or"
msgstr ""

#: library/contextvars.rst:66
msgid "raise a :exc:`LookupError`."
msgstr ""

#: library/contextvars.rst:70
msgid ""
"Call to set a new value for the context variable in the current context."
msgstr ""

#: library/contextvars.rst:73
msgid ""
"The required *value* argument is the new value for the context variable."
msgstr ""

#: library/contextvars.rst:76
msgid ""
"Returns a :class:`~contextvars.Token` object that can be used to restore the "
"variable to its previous value via the :meth:`ContextVar.reset` method."
msgstr ""

#: library/contextvars.rst:82
msgid ""
"Reset the context variable to the value it had before the :meth:`ContextVar."
"set` that created the *token* was used."
msgstr ""

#: library/contextvars.rst:85
msgid "For example::"
msgstr ""

#: library/contextvars.rst:87
msgid ""
"var = ContextVar('var')\n"
"\n"
"token = var.set('new value')\n"
"# code that uses 'var'; var.get() returns 'new value'.\n"
"var.reset(token)\n"
"\n"
"# After the reset call the var has no value again, so\n"
"# var.get() would raise a LookupError."
msgstr ""

#: library/contextvars.rst:99
msgid ""
"*Token* objects are returned by the :meth:`ContextVar.set` method. They can "
"be passed to the :meth:`ContextVar.reset` method to revert the value of the "
"variable to what it was before the corresponding *set*."
msgstr ""

#: library/contextvars.rst:106
msgid ""
"A read-only property.  Points to the :class:`ContextVar` object that created "
"the token."
msgstr ""

#: library/contextvars.rst:111
msgid ""
"A read-only property.  Set to the value the variable had before the :meth:"
"`ContextVar.set` method call that created the token. It points to :attr:"
"`Token.MISSING` if the variable was not set before the call."
msgstr ""

#: library/contextvars.rst:118
msgid "A marker object used by :attr:`Token.old_value`."
msgstr ""

#: library/contextvars.rst:122
msgid "Manual Context Management"
msgstr ""

#: library/contextvars.rst:126
msgid "Returns a copy of the current :class:`~contextvars.Context` object."
msgstr ""

#: library/contextvars.rst:128
msgid ""
"The following snippet gets a copy of the current context and prints all "
"variables and their values that are set in it::"
msgstr ""

#: library/contextvars.rst:131
msgid ""
"ctx: Context = copy_context()\n"
"print(list(ctx.items()))"
msgstr ""

#: library/contextvars.rst:134
msgid ""
"The function has an *O*\\ (1) complexity, i.e. works equally fast for "
"contexts with a few context variables and for contexts that have a lot of "
"them."
msgstr ""

#: library/contextvars.rst:141
msgid "A mapping of :class:`ContextVars <ContextVar>` to their values."
msgstr ""

#: library/contextvars.rst:143
msgid ""
"``Context()`` creates an empty context with no values in it. To get a copy "
"of the current context use the :func:`~contextvars.copy_context` function."
msgstr ""

#: library/contextvars.rst:147
msgid ""
"Every thread will have a different top-level :class:`~contextvars.Context` "
"object. This means that a :class:`ContextVar` object behaves in a similar "
"fashion to :func:`threading.local` when values are assigned in different "
"threads."
msgstr ""

#: library/contextvars.rst:152
msgid "Context implements the :class:`collections.abc.Mapping` interface."
msgstr ""

#: library/contextvars.rst:156
msgid ""
"Execute ``callable(*args, **kwargs)`` code in the context object the *run* "
"method is called on.  Return the result of the execution or propagate an "
"exception if one occurred."
msgstr ""

#: library/contextvars.rst:160
msgid ""
"Any changes to any context variables that *callable* makes will be contained "
"in the context object::"
msgstr ""

#: library/contextvars.rst:163
msgid ""
"var = ContextVar('var')\n"
"var.set('spam')\n"
"\n"
"def main():\n"
"    # 'var' was set to 'spam' before\n"
"    # calling 'copy_context()' and 'ctx.run(main)', so:\n"
"    # var.get() == ctx[var] == 'spam'\n"
"\n"
"    var.set('ham')\n"
"\n"
"    # Now, after setting 'var' to 'ham':\n"
"    # var.get() == ctx[var] == 'ham'\n"
"\n"
"ctx = copy_context()\n"
"\n"
"# Any changes that the 'main' function makes to 'var'\n"
"# will be contained in 'ctx'.\n"
"ctx.run(main)\n"
"\n"
"# The 'main()' function was run in the 'ctx' context,\n"
"# so changes to 'var' are contained in it:\n"
"# ctx[var] == 'ham'\n"
"\n"
"# However, outside of 'ctx', 'var' is still set to 'spam':\n"
"# var.get() == 'spam'"
msgstr ""

#: library/contextvars.rst:189
msgid ""
"The method raises a :exc:`RuntimeError` when called on the same context "
"object from more than one OS thread, or when called recursively."
msgstr ""

#: library/contextvars.rst:195
msgid "Return a shallow copy of the context object."
msgstr ""

#: library/contextvars.rst:199
msgid ""
"Return ``True`` if the *context* has a value for *var* set; return ``False`` "
"otherwise."
msgstr ""

#: library/contextvars.rst:204
msgid ""
"Return the value of the *var* :class:`ContextVar` variable. If the variable "
"is not set in the context object, a :exc:`KeyError` is raised."
msgstr ""

#: library/contextvars.rst:210
msgid ""
"Return the value for *var* if *var* has the value in the context object.  "
"Return *default* otherwise.  If *default* is not given, return ``None``."
msgstr ""

#: library/contextvars.rst:216
msgid "Return an iterator over the variables stored in the context object."
msgstr ""

#: library/contextvars.rst:221
msgid "Return the number of variables set in the context object."
msgstr ""

#: library/contextvars.rst:225
msgid "Return a list of all variables in the context object."
msgstr ""

#: library/contextvars.rst:229
msgid "Return a list of all variables' values in the context object."
msgstr ""

#: library/contextvars.rst:234
msgid ""
"Return a list of 2-tuples containing all variables and their values in the "
"context object."
msgstr ""

#: library/contextvars.rst:239
msgid "asyncio support"
msgstr ""

#: library/contextvars.rst:241
msgid ""
"Context variables are natively supported in :mod:`asyncio` and are ready to "
"be used without any extra configuration.  For example, here is a simple echo "
"server, that uses a context variable to make the address of a remote client "
"available in the Task that handles that client::"
msgstr ""

#: library/contextvars.rst:247
msgid ""
"import asyncio\n"
"import contextvars\n"
"\n"
"client_addr_var = contextvars.ContextVar('client_addr')\n"
"\n"
"def render_goodbye():\n"
"    # The address of the currently handled client can be accessed\n"
"    # without passing it explicitly to this function.\n"
"\n"
"    client_addr = client_addr_var.get()\n"
"    return f'Good bye, client @ {client_addr}\\r\\n'.encode()\n"
"\n"
"async def handle_request(reader, writer):\n"
"    addr = writer.transport.get_extra_info('socket').getpeername()\n"
"    client_addr_var.set(addr)\n"
"\n"
"    # In any code that we call is now possible to get\n"
"    # client's address by calling 'client_addr_var.get()'.\n"
"\n"
"    while True:\n"
"        line = await reader.readline()\n"
"        print(line)\n"
"        if not line.strip():\n"
"            break\n"
"\n"
"    writer.write(b'HTTP/1.1 200 OK\\r\\n')  # status line\n"
"    writer.write(b'\\r\\n')  # headers\n"
"    writer.write(render_goodbye())  # body\n"
"    writer.close()\n"
"\n"
"async def main():\n"
"    srv = await asyncio.start_server(\n"
"        handle_request, '127.0.0.1', 8081)\n"
"\n"
"    async with srv:\n"
"        await srv.serve_forever()\n"
"\n"
"asyncio.run(main())\n"
"\n"
"# To test it you can use telnet or curl:\n"
"#     telnet 127.0.0.1 8081\n"
"#     curl 127.0.0.1:8081"
msgstr ""