-
-
Notifications
You must be signed in to change notification settings - Fork 40
Expand file tree
/
Copy pathcontextlib.po
More file actions
749 lines (637 loc) · 25.9 KB
/
contextlib.po
File metadata and controls
749 lines (637 loc) · 25.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
# SOME DESCRIPTIVE TITLE.
# Copyright (C) 2001-2024, Python Software Foundation
# This file is distributed under the same license as the Python package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
# Translators:
# Marco Rougeth <marco@rougeth.com>, 2020
# Claudio Rogerio Carvalho Filho <excriptbrasil@gmail.com>, 2020
# i17obot <i17obot@rougeth.com>, 2020
# Rafael Fontenelle <rffontenelle@gmail.com>, 2024
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: Python 3.8\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2024-10-04 17:06+0000\n"
"PO-Revision-Date: 2020-05-30 11:58+0000\n"
"Last-Translator: Rafael Fontenelle <rffontenelle@gmail.com>, 2024\n"
"Language-Team: Portuguese (Brazil) (https://app.transifex.com/python-doc/"
"teams/5390/pt_BR/)\n"
"Language: pt_BR\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Plural-Forms: nplurals=3; plural=(n == 0 || n == 1) ? 0 : n != 0 && n % "
"1000000 == 0 ? 1 : 2;\n"
#: ../../library/contextlib.rst:2
msgid ""
":mod:`!contextlib` --- Utilities for :keyword:`!with`\\ -statement contexts"
msgstr ""
#: ../../library/contextlib.rst:7
msgid "**Source code:** :source:`Lib/contextlib.py`"
msgstr "**Código-fonte:** :source:`Lib/contextlib.py`"
#: ../../library/contextlib.rst:11
msgid ""
"This module provides utilities for common tasks involving "
"the :keyword:`with` statement. For more information see "
"also :ref:`typecontextmanager` and :ref:`context-managers`."
msgstr ""
#: ../../library/contextlib.rst:17
msgid "Utilities"
msgstr "Utilitários"
#: ../../library/contextlib.rst:19
msgid "Functions and classes provided:"
msgstr ""
#: ../../library/contextlib.rst:23
msgid ""
"An :term:`abstract base class` for classes that "
"implement :meth:`object.__enter__` and :meth:`object.__exit__`. A default "
"implementation for :meth:`object.__enter__` is provided which returns "
"``self`` while :meth:`object.__exit__` is an abstract method which by "
"default returns ``None``. See also the definition "
"of :ref:`typecontextmanager`."
msgstr ""
#: ../../library/contextlib.rst:34
msgid ""
"An :term:`abstract base class` for classes that "
"implement :meth:`object.__aenter__` and :meth:`object.__aexit__`. A default "
"implementation for :meth:`object.__aenter__` is provided which returns "
"``self`` while :meth:`object.__aexit__` is an abstract method which by "
"default returns ``None``. See also the definition of :ref:`async-context-"
"managers`."
msgstr ""
#: ../../library/contextlib.rst:46
msgid ""
"This function is a :term:`decorator` that can be used to define a factory "
"function for :keyword:`with` statement context managers, without needing to "
"create a class or separate :meth:`__enter__` and :meth:`__exit__` methods."
msgstr ""
#: ../../library/contextlib.rst:50
msgid ""
"While many objects natively support use in with statements, sometimes a "
"resource needs to be managed that isn't a context manager in its own right, "
"and doesn't implement a ``close()`` method for use with "
"``contextlib.closing``"
msgstr ""
#: ../../library/contextlib.rst:54
msgid ""
"An abstract example would be the following to ensure correct resource "
"management::"
msgstr ""
#: ../../library/contextlib.rst:73
msgid ""
"The function being decorated must return a :term:`generator`-iterator when "
"called. This iterator must yield exactly one value, which will be bound to "
"the targets in the :keyword:`with` statement's :keyword:`!as` clause, if any."
msgstr ""
#: ../../library/contextlib.rst:77
msgid ""
"At the point where the generator yields, the block nested in "
"the :keyword:`with` statement is executed. The generator is then resumed "
"after the block is exited. If an unhandled exception occurs in the block, it "
"is reraised inside the generator at the point where the yield occurred. "
"Thus, you can use a :keyword:`try`...\\ :keyword:`except`..."
"\\ :keyword:`finally` statement to trap the error (if any), or ensure that "
"some cleanup takes place. If an exception is trapped merely in order to log "
"it or to perform some action (rather than to suppress it entirely), the "
"generator must reraise that exception. Otherwise the generator context "
"manager will indicate to the :keyword:`!with` statement that the exception "
"has been handled, and execution will resume with the statement immediately "
"following the :keyword:`!with` statement."
msgstr ""
#: ../../library/contextlib.rst:89
msgid ""
":func:`contextmanager` uses :class:`ContextDecorator` so the context "
"managers it creates can be used as decorators as well as in :keyword:`with` "
"statements. When used as a decorator, a new generator instance is implicitly "
"created on each function call (this allows the otherwise \"one-shot\" "
"context managers created by :func:`contextmanager` to meet the requirement "
"that context managers support multiple invocations in order to be used as "
"decorators)."
msgstr ""
#: ../../library/contextlib.rst:96
msgid "Use of :class:`ContextDecorator`."
msgstr ""
#: ../../library/contextlib.rst:102
msgid ""
"Similar to :func:`~contextlib.contextmanager`, but creates "
"an :ref:`asynchronous context manager <async-context-managers>`."
msgstr ""
#: ../../library/contextlib.rst:105
msgid ""
"This function is a :term:`decorator` that can be used to define a factory "
"function for :keyword:`async with` statement asynchronous context managers, "
"without needing to create a class or separate :meth:`__aenter__` "
"and :meth:`__aexit__` methods. It must be applied to an :term:`asynchronous "
"generator` function."
msgstr ""
#: ../../library/contextlib.rst:111
msgid "A simple example::"
msgstr "Um exemplo simples::"
#: ../../library/contextlib.rst:132
msgid ""
"Return a context manager that closes *thing* upon completion of the block. "
"This is basically equivalent to::"
msgstr ""
#: ../../library/contextlib.rst:144
msgid "And lets you write code like this::"
msgstr ""
#: ../../library/contextlib.rst:153
msgid ""
"without needing to explicitly close ``page``. Even if an error occurs, "
"``page.close()`` will be called when the :keyword:`with` block is exited."
msgstr ""
#: ../../library/contextlib.rst:161
msgid ""
"Return a context manager that returns *enter_result* from ``__enter__``, but "
"otherwise does nothing. It is intended to be used as a stand-in for an "
"optional context manager, for example::"
msgstr ""
#: ../../library/contextlib.rst:175
msgid "An example using *enter_result*::"
msgstr ""
#: ../../library/contextlib.rst:193
msgid ""
"Return a context manager that suppresses any of the specified exceptions if "
"they occur in the body of a with statement and then resumes execution with "
"the first statement following the end of the with statement."
msgstr ""
#: ../../library/contextlib.rst:197
msgid ""
"As with any other mechanism that completely suppresses exceptions, this "
"context manager should be used only to cover very specific errors where "
"silently continuing with program execution is known to be the right thing to "
"do."
msgstr ""
#: ../../library/contextlib.rst:202
msgid "For example::"
msgstr "Por exemplo::"
#: ../../library/contextlib.rst:212
msgid "This code is equivalent to::"
msgstr ""
#: ../../library/contextlib.rst:224 ../../library/contextlib.rst:263
#: ../../library/contextlib.rst:273
msgid "This context manager is :ref:`reentrant <reentrant-cms>`."
msgstr ""
#: ../../library/contextlib.rst:231
msgid ""
"Context manager for temporarily redirecting :data:`sys.stdout` to another "
"file or file-like object."
msgstr ""
#: ../../library/contextlib.rst:234
msgid ""
"This tool adds flexibility to existing functions or classes whose output is "
"hardwired to stdout."
msgstr ""
#: ../../library/contextlib.rst:237
msgid ""
"For example, the output of :func:`help` normally is sent to *sys.stdout*. "
"You can capture that output in a string by redirecting the output to "
"an :class:`io.StringIO` object::"
msgstr ""
#: ../../library/contextlib.rst:246
msgid ""
"To send the output of :func:`help` to a file on disk, redirect the output to "
"a regular file::"
msgstr ""
#: ../../library/contextlib.rst:253
msgid "To send the output of :func:`help` to *sys.stderr*::"
msgstr ""
#: ../../library/contextlib.rst:258
msgid ""
"Note that the global side effect on :data:`sys.stdout` means that this "
"context manager is not suitable for use in library code and most threaded "
"applications. It also has no effect on the output of subprocesses. However, "
"it is still a useful approach for many utility scripts."
msgstr ""
#: ../../library/contextlib.rst:270
msgid ""
"Similar to :func:`~contextlib.redirect_stdout` but "
"redirecting :data:`sys.stderr` to another file or file-like object."
msgstr ""
#: ../../library/contextlib.rst:280
msgid ""
"A base class that enables a context manager to also be used as a decorator."
msgstr ""
#: ../../library/contextlib.rst:282
msgid ""
"Context managers inheriting from ``ContextDecorator`` have to implement "
"``__enter__`` and ``__exit__`` as normal. ``__exit__`` retains its optional "
"exception handling even when used as a decorator."
msgstr ""
#: ../../library/contextlib.rst:286
msgid ""
"``ContextDecorator`` is used by :func:`contextmanager`, so you get this "
"functionality automatically."
msgstr ""
#: ../../library/contextlib.rst:289
msgid "Example of ``ContextDecorator``::"
msgstr ""
#: ../../library/contextlib.rst:318
msgid ""
"This change is just syntactic sugar for any construct of the following form::"
msgstr ""
#: ../../library/contextlib.rst:324
msgid "``ContextDecorator`` lets you instead write::"
msgstr ""
#: ../../library/contextlib.rst:330
msgid ""
"It makes it clear that the ``cm`` applies to the whole function, rather than "
"just a piece of it (and saving an indentation level is nice, too)."
msgstr ""
#: ../../library/contextlib.rst:333
msgid ""
"Existing context managers that already have a base class can be extended by "
"using ``ContextDecorator`` as a mixin class::"
msgstr ""
#: ../../library/contextlib.rst:346
msgid ""
"As the decorated function must be able to be called multiple times, the "
"underlying context manager must support use in multiple :keyword:`with` "
"statements. If this is not the case, then the original construct with the "
"explicit :keyword:`!with` statement inside the function should be used."
msgstr ""
#: ../../library/contextlib.rst:356
msgid ""
"A context manager that is designed to make it easy to programmatically "
"combine other context managers and cleanup functions, especially those that "
"are optional or otherwise driven by input data."
msgstr ""
#: ../../library/contextlib.rst:360
msgid ""
"For example, a set of files may easily be handled in a single with statement "
"as follows::"
msgstr ""
#: ../../library/contextlib.rst:369
msgid ""
"Each instance maintains a stack of registered callbacks that are called in "
"reverse order when the instance is closed (either explicitly or implicitly "
"at the end of a :keyword:`with` statement). Note that callbacks are *not* "
"invoked implicitly when the context stack instance is garbage collected."
msgstr ""
#: ../../library/contextlib.rst:374
msgid ""
"This stack model is used so that context managers that acquire their "
"resources in their ``__init__`` method (such as file objects) can be handled "
"correctly."
msgstr ""
#: ../../library/contextlib.rst:378
msgid ""
"Since registered callbacks are invoked in the reverse order of registration, "
"this ends up behaving as if multiple nested :keyword:`with` statements had "
"been used with the registered set of callbacks. This even extends to "
"exception handling - if an inner callback suppresses or replaces an "
"exception, then outer callbacks will be passed arguments based on that "
"updated state."
msgstr ""
#: ../../library/contextlib.rst:385
msgid ""
"This is a relatively low level API that takes care of the details of "
"correctly unwinding the stack of exit callbacks. It provides a suitable "
"foundation for higher level context managers that manipulate the exit stack "
"in application specific ways."
msgstr ""
#: ../../library/contextlib.rst:394
msgid ""
"Enters a new context manager and adds its :meth:`__exit__` method to the "
"callback stack. The return value is the result of the context manager's "
"own :meth:`__enter__` method."
msgstr ""
#: ../../library/contextlib.rst:398
msgid ""
"These context managers may suppress exceptions just as they normally would "
"if used directly as part of a :keyword:`with` statement."
msgstr ""
#: ../../library/contextlib.rst:403
msgid "Adds a context manager's :meth:`__exit__` method to the callback stack."
msgstr ""
#: ../../library/contextlib.rst:405
msgid ""
"As ``__enter__`` is *not* invoked, this method can be used to cover part of "
"an :meth:`__enter__` implementation with a context manager's "
"own :meth:`__exit__` method."
msgstr ""
#: ../../library/contextlib.rst:409
msgid ""
"If passed an object that is not a context manager, this method assumes it is "
"a callback with the same signature as a context manager's :meth:`__exit__` "
"method and adds it directly to the callback stack."
msgstr ""
#: ../../library/contextlib.rst:413
msgid ""
"By returning true values, these callbacks can suppress exceptions the same "
"way context manager :meth:`__exit__` methods can."
msgstr ""
#: ../../library/contextlib.rst:416
msgid ""
"The passed in object is returned from the function, allowing this method to "
"be used as a function decorator."
msgstr ""
#: ../../library/contextlib.rst:421
msgid ""
"Accepts an arbitrary callback function and arguments and adds it to the "
"callback stack."
msgstr ""
#: ../../library/contextlib.rst:424
msgid ""
"Unlike the other methods, callbacks added this way cannot suppress "
"exceptions (as they are never passed the exception details)."
msgstr ""
#: ../../library/contextlib.rst:427
msgid ""
"The passed in callback is returned from the function, allowing this method "
"to be used as a function decorator."
msgstr ""
#: ../../library/contextlib.rst:432
msgid ""
"Transfers the callback stack to a fresh :class:`ExitStack` instance and "
"returns it. No callbacks are invoked by this operation - instead, they will "
"now be invoked when the new stack is closed (either explicitly or implicitly "
"at the end of a :keyword:`with` statement)."
msgstr ""
#: ../../library/contextlib.rst:437
msgid ""
"For example, a group of files can be opened as an \"all or nothing\" "
"operation as follows::"
msgstr ""
#: ../../library/contextlib.rst:451
msgid ""
"Immediately unwinds the callback stack, invoking callbacks in the reverse "
"order of registration. For any context managers and exit callbacks "
"registered, the arguments passed in will indicate that no exception occurred."
msgstr ""
#: ../../library/contextlib.rst:458
msgid ""
"An :ref:`asynchronous context manager <async-context-managers>`, similar "
"to :class:`ExitStack`, that supports combining both synchronous and "
"asynchronous context managers, as well as having coroutines for cleanup "
"logic."
msgstr ""
#: ../../library/contextlib.rst:463
msgid ""
"The :meth:`close` method is not implemented, :meth:`aclose` must be used "
"instead."
msgstr ""
#: ../../library/contextlib.rst:468
msgid ""
"Similar to :meth:`enter_context` but expects an asynchronous context manager."
msgstr ""
#: ../../library/contextlib.rst:473
msgid ""
"Similar to :meth:`push` but expects either an asynchronous context manager "
"or a coroutine function."
msgstr ""
#: ../../library/contextlib.rst:478
msgid "Similar to :meth:`callback` but expects a coroutine function."
msgstr ""
#: ../../library/contextlib.rst:482
msgid "Similar to :meth:`close` but properly handles awaitables."
msgstr ""
#: ../../library/contextlib.rst:484
msgid "Continuing the example for :func:`asynccontextmanager`::"
msgstr ""
#: ../../library/contextlib.rst:496
msgid "Examples and Recipes"
msgstr "Exemplos e receitas"
#: ../../library/contextlib.rst:498
msgid ""
"This section describes some examples and recipes for making effective use of "
"the tools provided by :mod:`contextlib`."
msgstr ""
#: ../../library/contextlib.rst:503
msgid "Supporting a variable number of context managers"
msgstr ""
#: ../../library/contextlib.rst:505
msgid ""
"The primary use case for :class:`ExitStack` is the one given in the class "
"documentation: supporting a variable number of context managers and other "
"cleanup operations in a single :keyword:`with` statement. The variability "
"may come from the number of context managers needed being driven by user "
"input (such as opening a user specified collection of files), or from some "
"of the context managers being optional::"
msgstr ""
#: ../../library/contextlib.rst:520
msgid ""
"As shown, :class:`ExitStack` also makes it quite easy to use :keyword:`with` "
"statements to manage arbitrary resources that don't natively support the "
"context management protocol."
msgstr ""
#: ../../library/contextlib.rst:526
msgid "Catching exceptions from ``__enter__`` methods"
msgstr ""
#: ../../library/contextlib.rst:528
msgid ""
"It is occasionally desirable to catch exceptions from an ``__enter__`` "
"method implementation, *without* inadvertently catching exceptions from "
"the :keyword:`with` statement body or the context manager's ``__exit__`` "
"method. By using :class:`ExitStack` the steps in the context management "
"protocol can be separated slightly in order to allow this::"
msgstr ""
#: ../../library/contextlib.rst:543
msgid ""
"Actually needing to do this is likely to indicate that the underlying API "
"should be providing a direct resource management interface for use "
"with :keyword:`try`/:keyword:`except`/:keyword:`finally` statements, but not "
"all APIs are well designed in that regard. When a context manager is the "
"only resource management API provided, then :class:`ExitStack` can make it "
"easier to handle various situations that can't be handled directly in "
"a :keyword:`with` statement."
msgstr ""
#: ../../library/contextlib.rst:553
msgid "Cleaning up in an ``__enter__`` implementation"
msgstr ""
#: ../../library/contextlib.rst:555
msgid ""
"As noted in the documentation of :meth:`ExitStack.push`, this method can be "
"useful in cleaning up an already allocated resource if later steps in "
"the :meth:`__enter__` implementation fail."
msgstr ""
#: ../../library/contextlib.rst:559
msgid ""
"Here's an example of doing this for a context manager that accepts resource "
"acquisition and release functions, along with an optional validation "
"function, and maps them to the context management protocol::"
msgstr ""
#: ../../library/contextlib.rst:599
msgid "Replacing any use of ``try-finally`` and flag variables"
msgstr ""
#: ../../library/contextlib.rst:601
msgid ""
"A pattern you will sometimes see is a ``try-finally`` statement with a flag "
"variable to indicate whether or not the body of the ``finally`` clause "
"should be executed. In its simplest form (that can't already be handled just "
"by using an ``except`` clause instead), it looks something like this::"
msgstr ""
#: ../../library/contextlib.rst:615
msgid ""
"As with any ``try`` statement based code, this can cause problems for "
"development and review, because the setup code and the cleanup code can end "
"up being separated by arbitrarily long sections of code."
msgstr ""
#: ../../library/contextlib.rst:619
msgid ""
":class:`ExitStack` makes it possible to instead register a callback for "
"execution at the end of a ``with`` statement, and then later decide to skip "
"executing that callback::"
msgstr ""
#: ../../library/contextlib.rst:631
msgid ""
"This allows the intended cleanup up behaviour to be made explicit up front, "
"rather than requiring a separate flag variable."
msgstr ""
#: ../../library/contextlib.rst:634
msgid ""
"If a particular application uses this pattern a lot, it can be simplified "
"even further by means of a small helper class::"
msgstr ""
#: ../../library/contextlib.rst:652
msgid ""
"If the resource cleanup isn't already neatly bundled into a standalone "
"function, then it is still possible to use the decorator form "
"of :meth:`ExitStack.callback` to declare the resource cleanup in advance::"
msgstr ""
#: ../../library/contextlib.rst:667
msgid ""
"Due to the way the decorator protocol works, a callback function declared "
"this way cannot take any parameters. Instead, any resources to be released "
"must be accessed as closure variables."
msgstr ""
"Devido à maneira como o protocolo decorador funciona, uma função de retorno "
"de chamada declarada dessa forma não pode receber nenhum parâmetro. Em vez "
"disso, quaisquer recursos a serem liberados devem ser acessados como "
"variáveis de clausura."
#: ../../library/contextlib.rst:673
msgid "Using a context manager as a function decorator"
msgstr ""
#: ../../library/contextlib.rst:675
msgid ""
":class:`ContextDecorator` makes it possible to use a context manager in both "
"an ordinary ``with`` statement and also as a function decorator."
msgstr ""
#: ../../library/contextlib.rst:678
msgid ""
"For example, it is sometimes useful to wrap functions or groups of "
"statements with a logger that can track the time of entry and time of exit. "
"Rather than writing both a function decorator and a context manager for the "
"task, inheriting from :class:`ContextDecorator` provides both capabilities "
"in a single definition::"
msgstr ""
#: ../../library/contextlib.rst:699
msgid "Instances of this class can be used as both a context manager::"
msgstr ""
#: ../../library/contextlib.rst:705
msgid "And also as a function decorator::"
msgstr ""
#: ../../library/contextlib.rst:712
msgid ""
"Note that there is one additional limitation when using context managers as "
"function decorators: there's no way to access the return value "
"of :meth:`__enter__`. If that value is needed, then it is still necessary to "
"use an explicit ``with`` statement."
msgstr ""
#: ../../library/contextlib.rst:720
msgid ":pep:`343` - The \"with\" statement"
msgstr ":pep:`343` - A instrução \"with\""
#: ../../library/contextlib.rst:720
msgid ""
"The specification, background, and examples for the Python :keyword:`with` "
"statement."
msgstr ""
"A especificação, o histórico e os exemplos para a instrução "
"Python :keyword:`with`."
#: ../../library/contextlib.rst:726
msgid "Single use, reusable and reentrant context managers"
msgstr ""
#: ../../library/contextlib.rst:728
msgid ""
"Most context managers are written in a way that means they can only be used "
"effectively in a :keyword:`with` statement once. These single use context "
"managers must be created afresh each time they're used - attempting to use "
"them a second time will trigger an exception or otherwise not work correctly."
msgstr ""
#: ../../library/contextlib.rst:734
msgid ""
"This common limitation means that it is generally advisable to create "
"context managers directly in the header of the :keyword:`with` statement "
"where they are used (as shown in all of the usage examples above)."
msgstr ""
#: ../../library/contextlib.rst:738
msgid ""
"Files are an example of effectively single use context managers, since the "
"first :keyword:`with` statement will close the file, preventing any further "
"IO operations using that file object."
msgstr ""
#: ../../library/contextlib.rst:742
msgid ""
"Context managers created using :func:`contextmanager` are also single use "
"context managers, and will complain about the underlying generator failing "
"to yield if an attempt is made to use them a second time::"
msgstr ""
#: ../../library/contextlib.rst:770
msgid "Reentrant context managers"
msgstr ""
#: ../../library/contextlib.rst:772
msgid ""
"More sophisticated context managers may be \"reentrant\". These context "
"managers can not only be used in multiple :keyword:`with` statements, but "
"may also be used *inside* a :keyword:`!with` statement that is already using "
"the same context manager."
msgstr ""
#: ../../library/contextlib.rst:777
msgid ""
":class:`threading.RLock` is an example of a reentrant context manager, as "
"are :func:`suppress` and :func:`redirect_stdout`. Here's a very simple "
"example of reentrant use::"
msgstr ""
#: ../../library/contextlib.rst:796
msgid ""
"Real world examples of reentrancy are more likely to involve multiple "
"functions calling each other and hence be far more complicated than this "
"example."
msgstr ""
#: ../../library/contextlib.rst:800
msgid ""
"Note also that being reentrant is *not* the same thing as being thread "
"safe. :func:`redirect_stdout`, for example, is definitely not thread safe, "
"as it makes a global modification to the system state by "
"binding :data:`sys.stdout` to a different stream."
msgstr ""
#: ../../library/contextlib.rst:809
msgid "Reusable context managers"
msgstr "Gerenciadores de contexto reutilizáveis"
#: ../../library/contextlib.rst:811
msgid ""
"Distinct from both single use and reentrant context managers are "
"\"reusable\" context managers (or, to be completely explicit, \"reusable, "
"but not reentrant\" context managers, since reentrant context managers are "
"also reusable). These context managers support being used multiple times, "
"but will fail (or otherwise not work correctly) if the specific context "
"manager instance has already been used in a containing with statement."
msgstr ""
#: ../../library/contextlib.rst:818
msgid ""
":class:`threading.Lock` is an example of a reusable, but not reentrant, "
"context manager (for a reentrant lock, it is necessary to "
"use :class:`threading.RLock` instead)."
msgstr ""
#: ../../library/contextlib.rst:822
msgid ""
"Another example of a reusable, but not reentrant, context manager "
"is :class:`ExitStack`, as it invokes *all* currently registered callbacks "
"when leaving any with statement, regardless of where those callbacks were "
"added::"
msgstr ""
#: ../../library/contextlib.rst:853
msgid ""
"As the output from the example shows, reusing a single stack object across "
"multiple with statements works correctly, but attempting to nest them will "
"cause the stack to be cleared at the end of the innermost with statement, "
"which is unlikely to be desirable behaviour."
msgstr ""
#: ../../library/contextlib.rst:858
msgid ""
"Using separate :class:`ExitStack` instances instead of reusing a single "
"instance avoids that problem::"
msgstr ""