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1857 lines (1567 loc) · 61.9 KB
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# SOME DESCRIPTIVE TITLE.
# Copyright (C) 2001-2025, Python Software Foundation
# This file is distributed under the same license as the Python package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
# Translators:
# python-doc bot, 2025
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: Python 3.9\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2025-09-22 21:56+0000\n"
"PO-Revision-Date: 2025-09-22 17:54+0000\n"
"Last-Translator: python-doc bot, 2025\n"
"Language-Team: Russian (https://app.transifex.com/python-doc/teams/5390/ru/)\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Language: ru\n"
"Plural-Forms: nplurals=4; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<12 || n%100>14) ? 1 : n%10==0 || (n%10>=5 && n%10<=9) || (n%100>=11 && n%100<=14)? 2 : 3);\n"
#: ../../library/argparse.rst:2
msgid ""
":mod:`argparse` --- Parser for command-line options, arguments and sub-"
"commands"
msgstr ""
#: ../../library/argparse.rst:12
msgid "**Source code:** :source:`Lib/argparse.py`"
msgstr ""
#: ../../library/argparse.rstNone
msgid "Tutorial"
msgstr ""
#: ../../library/argparse.rst:18
msgid ""
"This page contains the API reference information. For a more gentle "
"introduction to Python command-line parsing, have a look at the "
":ref:`argparse tutorial <argparse-tutorial>`."
msgstr ""
#: ../../library/argparse.rst:22
msgid ""
"The :mod:`argparse` module makes it easy to write user-friendly command-line"
" interfaces. The program defines what arguments it requires, and "
":mod:`argparse` will figure out how to parse those out of :data:`sys.argv`."
" The :mod:`argparse` module also automatically generates help and usage "
"messages and issues errors when users give the program invalid arguments."
msgstr ""
#: ../../library/argparse.rst:30
msgid "Example"
msgstr ""
#: ../../library/argparse.rst:32
msgid ""
"The following code is a Python program that takes a list of integers and "
"produces either the sum or the max::"
msgstr ""
#: ../../library/argparse.rst:47
msgid ""
"Assuming the Python code above is saved into a file called ``prog.py``, it "
"can be run at the command line and provides useful help messages:"
msgstr ""
#: ../../library/argparse.rst:64
msgid ""
"When run with the appropriate arguments, it prints either the sum or the max"
" of the command-line integers:"
msgstr ""
#: ../../library/argparse.rst:75
msgid "If invalid arguments are passed in, it will issue an error:"
msgstr ""
#: ../../library/argparse.rst:83
msgid "The following sections walk you through this example."
msgstr ""
#: ../../library/argparse.rst:87
msgid "Creating a parser"
msgstr ""
#: ../../library/argparse.rst:89
msgid ""
"The first step in using the :mod:`argparse` is creating an "
":class:`ArgumentParser` object::"
msgstr ""
#: ../../library/argparse.rst:94
msgid ""
"The :class:`ArgumentParser` object will hold all the information necessary "
"to parse the command line into Python data types."
msgstr ""
#: ../../library/argparse.rst:99
msgid "Adding arguments"
msgstr ""
#: ../../library/argparse.rst:101
msgid ""
"Filling an :class:`ArgumentParser` with information about program arguments "
"is done by making calls to the :meth:`~ArgumentParser.add_argument` method. "
"Generally, these calls tell the :class:`ArgumentParser` how to take the "
"strings on the command line and turn them into objects. This information is"
" stored and used when :meth:`~ArgumentParser.parse_args` is called. For "
"example::"
msgstr ""
#: ../../library/argparse.rst:113
msgid ""
"Later, calling :meth:`~ArgumentParser.parse_args` will return an object with"
" two attributes, ``integers`` and ``accumulate``. The ``integers`` "
"attribute will be a list of one or more ints, and the ``accumulate`` "
"attribute will be either the :func:`sum` function, if ``--sum`` was "
"specified at the command line, or the :func:`max` function if it was not."
msgstr ""
#: ../../library/argparse.rst:121
msgid "Parsing arguments"
msgstr ""
#: ../../library/argparse.rst:123
msgid ""
":class:`ArgumentParser` parses arguments through the "
":meth:`~ArgumentParser.parse_args` method. This will inspect the command "
"line, convert each argument to the appropriate type and then invoke the "
"appropriate action. In most cases, this means a simple :class:`Namespace` "
"object will be built up from attributes parsed out of the command line::"
msgstr ""
#: ../../library/argparse.rst:132
msgid ""
"In a script, :meth:`~ArgumentParser.parse_args` will typically be called "
"with no arguments, and the :class:`ArgumentParser` will automatically "
"determine the command-line arguments from :data:`sys.argv`."
msgstr ""
#: ../../library/argparse.rst:138
msgid "ArgumentParser objects"
msgstr ""
#: ../../library/argparse.rst:147
msgid ""
"Create a new :class:`ArgumentParser` object. All parameters should be passed"
" as keyword arguments. Each parameter has its own more detailed description "
"below, but in short they are:"
msgstr ""
#: ../../library/argparse.rst:151
msgid "prog_ - The name of the program (default: ``sys.argv[0]``)"
msgstr ""
#: ../../library/argparse.rst:153
msgid ""
"usage_ - The string describing the program usage (default: generated from "
"arguments added to parser)"
msgstr ""
#: ../../library/argparse.rst:156
msgid ""
"description_ - Text to display before the argument help (default: none)"
msgstr ""
#: ../../library/argparse.rst:158
msgid "epilog_ - Text to display after the argument help (default: none)"
msgstr ""
#: ../../library/argparse.rst:160
msgid ""
"parents_ - A list of :class:`ArgumentParser` objects whose arguments should "
"also be included"
msgstr ""
#: ../../library/argparse.rst:163
msgid "formatter_class_ - A class for customizing the help output"
msgstr ""
#: ../../library/argparse.rst:165
msgid ""
"prefix_chars_ - The set of characters that prefix optional arguments "
"(default: '-')"
msgstr ""
#: ../../library/argparse.rst:168
msgid ""
"fromfile_prefix_chars_ - The set of characters that prefix files from which "
"additional arguments should be read (default: ``None``)"
msgstr ""
#: ../../library/argparse.rst:171
msgid ""
"argument_default_ - The global default value for arguments (default: "
"``None``)"
msgstr ""
#: ../../library/argparse.rst:174
msgid ""
"conflict_handler_ - The strategy for resolving conflicting optionals "
"(usually unnecessary)"
msgstr ""
#: ../../library/argparse.rst:177
msgid ""
"add_help_ - Add a ``-h/--help`` option to the parser (default: ``True``)"
msgstr ""
#: ../../library/argparse.rst:179
msgid ""
"allow_abbrev_ - Allows long options to be abbreviated if the abbreviation is"
" unambiguous. (default: ``True``)"
msgstr ""
#: ../../library/argparse.rst:182
msgid ""
"exit_on_error_ - Determines whether or not ArgumentParser exits with error "
"info when an error occurs. (default: ``True``)"
msgstr ""
#: ../../library/argparse.rst:185
msgid "*allow_abbrev* parameter was added."
msgstr ""
#: ../../library/argparse.rst:188
msgid ""
"In previous versions, *allow_abbrev* also disabled grouping of short flags "
"such as ``-vv`` to mean ``-v -v``."
msgstr ""
#: ../../library/argparse.rst:192
msgid "*exit_on_error* parameter was added."
msgstr ""
#: ../../library/argparse.rst:195 ../../library/argparse.rst:715
msgid "The following sections describe how each of these are used."
msgstr ""
#: ../../library/argparse.rst:199
msgid "prog"
msgstr ""
#: ../../library/argparse.rst:201
msgid ""
"By default, :class:`ArgumentParser` objects use ``sys.argv[0]`` to determine"
" how to display the name of the program in help messages. This default is "
"almost always desirable because it will make the help messages match how the"
" program was invoked on the command line. For example, consider a file "
"named ``myprogram.py`` with the following code::"
msgstr ""
#: ../../library/argparse.rst:212
msgid ""
"The help for this program will display ``myprogram.py`` as the program name "
"(regardless of where the program was invoked from):"
msgstr ""
#: ../../library/argparse.rst:231
msgid ""
"To change this default behavior, another value can be supplied using the "
"``prog=`` argument to :class:`ArgumentParser`::"
msgstr ""
#: ../../library/argparse.rst:241
msgid ""
"Note that the program name, whether determined from ``sys.argv[0]`` or from "
"the ``prog=`` argument, is available to help messages using the ``%(prog)s``"
" format specifier."
msgstr ""
#: ../../library/argparse.rst:258
msgid "usage"
msgstr ""
#: ../../library/argparse.rst:260
msgid ""
"By default, :class:`ArgumentParser` calculates the usage message from the "
"arguments it contains::"
msgstr ""
#: ../../library/argparse.rst:276
msgid ""
"The default message can be overridden with the ``usage=`` keyword argument::"
msgstr ""
#: ../../library/argparse.rst:291
msgid ""
"The ``%(prog)s`` format specifier is available to fill in the program name "
"in your usage messages."
msgstr ""
#: ../../library/argparse.rst:296
msgid "description"
msgstr ""
#: ../../library/argparse.rst:298
msgid ""
"Most calls to the :class:`ArgumentParser` constructor will use the "
"``description=`` keyword argument. This argument gives a brief description "
"of what the program does and how it works. In help messages, the "
"description is displayed between the command-line usage string and the help "
"messages for the various arguments::"
msgstr ""
#: ../../library/argparse.rst:313
msgid ""
"By default, the description will be line-wrapped so that it fits within the "
"given space. To change this behavior, see the formatter_class_ argument."
msgstr ""
#: ../../library/argparse.rst:318
msgid "epilog"
msgstr ""
#: ../../library/argparse.rst:320
msgid ""
"Some programs like to display additional description of the program after "
"the description of the arguments. Such text can be specified using the "
"``epilog=`` argument to :class:`ArgumentParser`::"
msgstr ""
#: ../../library/argparse.rst:337
msgid ""
"As with the description_ argument, the ``epilog=`` text is by default line-"
"wrapped, but this behavior can be adjusted with the formatter_class_ "
"argument to :class:`ArgumentParser`."
msgstr ""
#: ../../library/argparse.rst:343
msgid "parents"
msgstr ""
#: ../../library/argparse.rst:345
msgid ""
"Sometimes, several parsers share a common set of arguments. Rather than "
"repeating the definitions of these arguments, a single parser with all the "
"shared arguments and passed to ``parents=`` argument to "
":class:`ArgumentParser` can be used. The ``parents=`` argument takes a list"
" of :class:`ArgumentParser` objects, collects all the positional and "
"optional actions from them, and adds these actions to the "
":class:`ArgumentParser` object being constructed::"
msgstr ""
#: ../../library/argparse.rst:365
msgid ""
"Note that most parent parsers will specify ``add_help=False``. Otherwise, "
"the :class:`ArgumentParser` will see two ``-h/--help`` options (one in the "
"parent and one in the child) and raise an error."
msgstr ""
#: ../../library/argparse.rst:370
msgid ""
"You must fully initialize the parsers before passing them via ``parents=``. "
"If you change the parent parsers after the child parser, those changes will "
"not be reflected in the child."
msgstr ""
#: ../../library/argparse.rst:376
msgid "formatter_class"
msgstr ""
#: ../../library/argparse.rst:378
msgid ""
":class:`ArgumentParser` objects allow the help formatting to be customized "
"by specifying an alternate formatting class. Currently, there are four such"
" classes:"
msgstr ""
#: ../../library/argparse.rst:387
msgid ""
":class:`RawDescriptionHelpFormatter` and :class:`RawTextHelpFormatter` give "
"more control over how textual descriptions are displayed. By default, "
":class:`ArgumentParser` objects line-wrap the description_ and epilog_ texts"
" in command-line help messages::"
msgstr ""
#: ../../library/argparse.rst:412
msgid ""
"Passing :class:`RawDescriptionHelpFormatter` as ``formatter_class=`` "
"indicates that description_ and epilog_ are already correctly formatted and "
"should not be line-wrapped::"
msgstr ""
#: ../../library/argparse.rst:438
msgid ""
":class:`RawTextHelpFormatter` maintains whitespace for all sorts of help "
"text, including argument descriptions. However, multiple new lines are "
"replaced with one. If you wish to preserve multiple blank lines, add spaces "
"between the newlines."
msgstr ""
#: ../../library/argparse.rst:443
msgid ""
":class:`ArgumentDefaultsHelpFormatter` automatically adds information about "
"default values to each of the argument help messages::"
msgstr ""
#: ../../library/argparse.rst:461
msgid ""
":class:`MetavarTypeHelpFormatter` uses the name of the type_ argument for "
"each argument as the display name for its values (rather than using the "
"dest_ as the regular formatter does)::"
msgstr ""
#: ../../library/argparse.rst:482
msgid "prefix_chars"
msgstr ""
#: ../../library/argparse.rst:484
msgid ""
"Most command-line options will use ``-`` as the prefix, e.g. ``-f/--foo``. "
"Parsers that need to support different or additional prefix characters, e.g."
" for options like ``+f`` or ``/foo``, may specify them using the "
"``prefix_chars=`` argument to the ArgumentParser constructor::"
msgstr ""
#: ../../library/argparse.rst:496
msgid ""
"The ``prefix_chars=`` argument defaults to ``'-'``. Supplying a set of "
"characters that does not include ``-`` will cause ``-f/--foo`` options to be"
" disallowed."
msgstr ""
#: ../../library/argparse.rst:502
msgid "fromfile_prefix_chars"
msgstr ""
#: ../../library/argparse.rst:504
msgid ""
"Sometimes, for example when dealing with a particularly long argument list, "
"it may make sense to keep the list of arguments in a file rather than typing"
" it out at the command line. If the ``fromfile_prefix_chars=`` argument is "
"given to the :class:`ArgumentParser` constructor, then arguments that start "
"with any of the specified characters will be treated as files, and will be "
"replaced by the arguments they contain. For example::"
msgstr ""
#: ../../library/argparse.rst:518
msgid ""
"Arguments read from a file must by default be one per line (but see also "
":meth:`~ArgumentParser.convert_arg_line_to_args`) and are treated as if they"
" were in the same place as the original file referencing argument on the "
"command line. So in the example above, the expression ``['-f', 'foo', "
"'@args.txt']`` is considered equivalent to the expression ``['-f', 'foo', "
"'-f', 'bar']``."
msgstr ""
#: ../../library/argparse.rst:524
msgid ""
"The ``fromfile_prefix_chars=`` argument defaults to ``None``, meaning that "
"arguments will never be treated as file references."
msgstr ""
#: ../../library/argparse.rst:529
msgid "argument_default"
msgstr ""
#: ../../library/argparse.rst:531
msgid ""
"Generally, argument defaults are specified either by passing a default to "
":meth:`~ArgumentParser.add_argument` or by calling the "
":meth:`~ArgumentParser.set_defaults` methods with a specific set of name-"
"value pairs. Sometimes however, it may be useful to specify a single "
"parser-wide default for arguments. This can be accomplished by passing the "
"``argument_default=`` keyword argument to :class:`ArgumentParser`. For "
"example, to globally suppress attribute creation on "
":meth:`~ArgumentParser.parse_args` calls, we supply "
"``argument_default=SUPPRESS``::"
msgstr ""
#: ../../library/argparse.rst:551
msgid "allow_abbrev"
msgstr ""
#: ../../library/argparse.rst:553
msgid ""
"Normally, when you pass an argument list to the "
":meth:`~ArgumentParser.parse_args` method of an :class:`ArgumentParser`, it "
":ref:`recognizes abbreviations <prefix-matching>` of long options."
msgstr ""
#: ../../library/argparse.rst:557
msgid ""
"This feature can be disabled by setting ``allow_abbrev`` to ``False``::"
msgstr ""
#: ../../library/argparse.rst:570
msgid "conflict_handler"
msgstr ""
#: ../../library/argparse.rst:572
msgid ""
":class:`ArgumentParser` objects do not allow two actions with the same "
"option string. By default, :class:`ArgumentParser` objects raise an "
"exception if an attempt is made to create an argument with an option string "
"that is already in use::"
msgstr ""
#: ../../library/argparse.rst:584
msgid ""
"Sometimes (e.g. when using parents_) it may be useful to simply override any"
" older arguments with the same option string. To get this behavior, the "
"value ``'resolve'`` can be supplied to the ``conflict_handler=`` argument of"
" :class:`ArgumentParser`::"
msgstr ""
#: ../../library/argparse.rst:600
msgid ""
"Note that :class:`ArgumentParser` objects only remove an action if all of "
"its option strings are overridden. So, in the example above, the old "
"``-f/--foo`` action is retained as the ``-f`` action, because only the "
"``--foo`` option string was overridden."
msgstr ""
#: ../../library/argparse.rst:607
msgid "add_help"
msgstr ""
#: ../../library/argparse.rst:609
msgid ""
"By default, ArgumentParser objects add an option which simply displays the "
"parser's help message. For example, consider a file named ``myprogram.py`` "
"containing the following code::"
msgstr ""
#: ../../library/argparse.rst:618
msgid ""
"If ``-h`` or ``--help`` is supplied at the command line, the ArgumentParser "
"help will be printed:"
msgstr ""
#: ../../library/argparse.rst:630
msgid ""
"Occasionally, it may be useful to disable the addition of this help option. "
"This can be achieved by passing ``False`` as the ``add_help=`` argument to "
":class:`ArgumentParser`::"
msgstr ""
#: ../../library/argparse.rst:642
msgid ""
"The help option is typically ``-h/--help``. The exception to this is if the "
"``prefix_chars=`` is specified and does not include ``-``, in which case "
"``-h`` and ``--help`` are not valid options. In this case, the first "
"character in ``prefix_chars`` is used to prefix the help options::"
msgstr ""
#: ../../library/argparse.rst:657
msgid "exit_on_error"
msgstr ""
#: ../../library/argparse.rst:659
msgid ""
"Normally, when you pass an invalid argument list to the "
":meth:`~ArgumentParser.parse_args` method of an :class:`ArgumentParser`, it "
"will exit with error info."
msgstr ""
#: ../../library/argparse.rst:662
msgid ""
"If the user would like to catch errors manually, the feature can be enabled "
"by setting ``exit_on_error`` to ``False``::"
msgstr ""
#: ../../library/argparse.rst:679
msgid "The add_argument() method"
msgstr ""
#: ../../library/argparse.rst:685
msgid ""
"Define how a single command-line argument should be parsed. Each parameter "
"has its own more detailed description below, but in short they are:"
msgstr ""
#: ../../library/argparse.rst:688
msgid ""
"`name or flags`_ - Either a name or a list of option strings, e.g. ``foo`` "
"or ``-f, --foo``."
msgstr ""
#: ../../library/argparse.rst:691
msgid ""
"action_ - The basic type of action to be taken when this argument is "
"encountered at the command line."
msgstr ""
#: ../../library/argparse.rst:694
msgid "nargs_ - The number of command-line arguments that should be consumed."
msgstr ""
#: ../../library/argparse.rst:696
msgid ""
"const_ - A constant value required by some action_ and nargs_ selections."
msgstr ""
#: ../../library/argparse.rst:698
msgid ""
"default_ - The value produced if the argument is absent from the command "
"line and if it is absent from the namespace object."
msgstr ""
#: ../../library/argparse.rst:701
msgid ""
"type_ - The type to which the command-line argument should be converted."
msgstr ""
#: ../../library/argparse.rst:703
msgid "choices_ - A container of the allowable values for the argument."
msgstr ""
#: ../../library/argparse.rst:705
msgid ""
"required_ - Whether or not the command-line option may be omitted (optionals"
" only)."
msgstr ""
#: ../../library/argparse.rst:708
msgid "help_ - A brief description of what the argument does."
msgstr ""
#: ../../library/argparse.rst:710
msgid "metavar_ - A name for the argument in usage messages."
msgstr ""
#: ../../library/argparse.rst:712
msgid ""
"dest_ - The name of the attribute to be added to the object returned by "
":meth:`parse_args`."
msgstr ""
#: ../../library/argparse.rst:719
msgid "name or flags"
msgstr ""
#: ../../library/argparse.rst:721
msgid ""
"The :meth:`~ArgumentParser.add_argument` method must know whether an "
"optional argument, like ``-f`` or ``--foo``, or a positional argument, like "
"a list of filenames, is expected. The first arguments passed to "
":meth:`~ArgumentParser.add_argument` must therefore be either a series of "
"flags, or a simple argument name. For example, an optional argument could "
"be created like::"
msgstr ""
#: ../../library/argparse.rst:730
msgid "while a positional argument could be created like::"
msgstr ""
#: ../../library/argparse.rst:734
msgid ""
"When :meth:`~ArgumentParser.parse_args` is called, optional arguments will "
"be identified by the ``-`` prefix, and the remaining arguments will be "
"assumed to be positional::"
msgstr ""
#: ../../library/argparse.rst:751
msgid "action"
msgstr ""
#: ../../library/argparse.rst:753
msgid ""
":class:`ArgumentParser` objects associate command-line arguments with "
"actions. These actions can do just about anything with the command-line "
"arguments associated with them, though most actions simply add an attribute "
"to the object returned by :meth:`~ArgumentParser.parse_args`. The "
"``action`` keyword argument specifies how the command-line arguments should "
"be handled. The supplied actions are:"
msgstr ""
#: ../../library/argparse.rst:759
msgid ""
"``'store'`` - This just stores the argument's value. This is the default "
"action. For example::"
msgstr ""
#: ../../library/argparse.rst:767
msgid ""
"``'store_const'`` - This stores the value specified by the const_ keyword "
"argument. The ``'store_const'`` action is most commonly used with optional "
"arguments that specify some sort of flag. For example::"
msgstr ""
#: ../../library/argparse.rst:776
msgid ""
"``'store_true'`` and ``'store_false'`` - These are special cases of "
"``'store_const'`` used for storing the values ``True`` and ``False`` "
"respectively. In addition, they create default values of ``False`` and "
"``True`` respectively. For example::"
msgstr ""
#: ../../library/argparse.rst:788
msgid ""
"``'append'`` - This stores a list, and appends each argument value to the "
"list. This is useful to allow an option to be specified multiple times. "
"Example usage::"
msgstr ""
#: ../../library/argparse.rst:797
msgid ""
"``'append_const'`` - This stores a list, and appends the value specified by "
"the const_ keyword argument to the list. (Note that the const_ keyword "
"argument defaults to ``None``.) The ``'append_const'`` action is typically "
"useful when multiple arguments need to store constants to the same list. For"
" example::"
msgstr ""
#: ../../library/argparse.rst:809
msgid ""
"``'count'`` - This counts the number of times a keyword argument occurs. For"
" example, this is useful for increasing verbosity levels::"
msgstr ""
#: ../../library/argparse.rst:817
msgid "Note, the *default* will be ``None`` unless explicitly set to *0*."
msgstr ""
#: ../../library/argparse.rst:819
msgid ""
"``'help'`` - This prints a complete help message for all the options in the "
"current parser and then exits. By default a help action is automatically "
"added to the parser. See :class:`ArgumentParser` for details of how the "
"output is created."
msgstr ""
#: ../../library/argparse.rst:824
msgid ""
"``'version'`` - This expects a ``version=`` keyword argument in the "
":meth:`~ArgumentParser.add_argument` call, and prints version information "
"and exits when invoked::"
msgstr ""
#: ../../library/argparse.rst:834
msgid ""
"``'extend'`` - This stores a list, and extends each argument value to the "
"list. Example usage::"
msgstr ""
#: ../../library/argparse.rst:845
msgid ""
"You may also specify an arbitrary action by passing an Action subclass or "
"other object that implements the same interface. The "
"``BooleanOptionalAction`` is available in ``argparse`` and adds support for "
"boolean actions such as ``--foo`` and ``--no-foo``::"
msgstr ""
#: ../../library/argparse.rst:858
msgid ""
"The recommended way to create a custom action is to extend :class:`Action`, "
"overriding the ``__call__`` method and optionally the ``__init__`` and "
"``format_usage`` methods."
msgstr ""
#: ../../library/argparse.rst:862
msgid "An example of a custom action::"
msgstr ""
#: ../../library/argparse.rst:882
msgid "For more details, see :class:`Action`."
msgstr ""
#: ../../library/argparse.rst:885
msgid "nargs"
msgstr ""
#: ../../library/argparse.rst:887
msgid ""
"ArgumentParser objects usually associate a single command-line argument with"
" a single action to be taken. The ``nargs`` keyword argument associates a "
"different number of command-line arguments with a single action. The "
"supported values are:"
msgstr ""
#: ../../library/argparse.rst:892
msgid ""
"``N`` (an integer). ``N`` arguments from the command line will be gathered "
"together into a list. For example::"
msgstr ""
#: ../../library/argparse.rst:901
msgid ""
"Note that ``nargs=1`` produces a list of one item. This is different from "
"the default, in which the item is produced by itself."
msgstr ""
#: ../../library/argparse.rst:906
msgid ""
"``'?'``. One argument will be consumed from the command line if possible, "
"and produced as a single item. If no command-line argument is present, the "
"value from default_ will be produced. Note that for optional arguments, "
"there is an additional case - the option string is present but not followed "
"by a command-line argument. In this case the value from const_ will be "
"produced. Some examples to illustrate this::"
msgstr ""
#: ../../library/argparse.rst:923
msgid ""
"One of the more common uses of ``nargs='?'`` is to allow optional input and "
"output files::"
msgstr ""
#: ../../library/argparse.rst:940
msgid ""
"``'*'``. All command-line arguments present are gathered into a list. Note"
" that it generally doesn't make much sense to have more than one positional "
"argument with ``nargs='*'``, but multiple optional arguments with "
"``nargs='*'`` is possible. For example::"
msgstr ""
#: ../../library/argparse.rst:954
msgid ""
"``'+'``. Just like ``'*'``, all command-line args present are gathered into "
"a list. Additionally, an error message will be generated if there wasn't at"
" least one command-line argument present. For example::"
msgstr ""
#: ../../library/argparse.rst:966
msgid ""
"If the ``nargs`` keyword argument is not provided, the number of arguments "
"consumed is determined by the action_. Generally this means a single "
"command-line argument will be consumed and a single item (not a list) will "
"be produced."
msgstr ""
#: ../../library/argparse.rst:972
msgid "const"
msgstr ""
#: ../../library/argparse.rst:974
msgid ""
"The ``const`` argument of :meth:`~ArgumentParser.add_argument` is used to "
"hold constant values that are not read from the command line but are "
"required for the various :class:`ArgumentParser` actions. The two most "
"common uses of it are:"
msgstr ""
#: ../../library/argparse.rst:978
msgid ""
"When :meth:`~ArgumentParser.add_argument` is called with "
"``action='store_const'`` or ``action='append_const'``. These actions add "
"the ``const`` value to one of the attributes of the object returned by "
":meth:`~ArgumentParser.parse_args`. See the action_ description for "
"examples."
msgstr ""
#: ../../library/argparse.rst:983
msgid ""
"When :meth:`~ArgumentParser.add_argument` is called with option strings "
"(like ``-f`` or ``--foo``) and ``nargs='?'``. This creates an optional "
"argument that can be followed by zero or one command-line arguments. When "
"parsing the command line, if the option string is encountered with no "
"command-line argument following it, the value of ``const`` will be assumed "
"instead. See the nargs_ description for examples."
msgstr ""
#: ../../library/argparse.rst:990
msgid ""
"With the ``'store_const'`` and ``'append_const'`` actions, the ``const`` "
"keyword argument must be given. For other actions, it defaults to ``None``."
msgstr ""
#: ../../library/argparse.rst:995
msgid "default"
msgstr ""
#: ../../library/argparse.rst:997
msgid ""
"All optional arguments and some positional arguments may be omitted at the "
"command line. The ``default`` keyword argument of "
":meth:`~ArgumentParser.add_argument`, whose value defaults to ``None``, "
"specifies what value should be used if the command-line argument is not "
"present. For optional arguments, the ``default`` value is used when the "
"option string was not present at the command line::"
msgstr ""
#: ../../library/argparse.rst:1011
msgid ""
"If the target namespace already has an attribute set, the action *default* "
"will not over write it::"
msgstr ""
#: ../../library/argparse.rst:1019
msgid ""
"If the ``default`` value is a string, the parser parses the value as if it "
"were a command-line argument. In particular, the parser applies any type_ "
"conversion argument, if provided, before setting the attribute on the "
":class:`Namespace` return value. Otherwise, the parser uses the value as "
"is::"
msgstr ""
#: ../../library/argparse.rst:1030
msgid ""
"For positional arguments with nargs_ equal to ``?`` or ``*``, the "
"``default`` value is used when no command-line argument was present::"
msgstr ""
#: ../../library/argparse.rst:1041
msgid ""
"Providing ``default=argparse.SUPPRESS`` causes no attribute to be added if "
"the command-line argument was not present::"
msgstr ""
#: ../../library/argparse.rst:1053
msgid "type"
msgstr ""
#: ../../library/argparse.rst:1055
msgid ""
"By default, the parser reads command-line arguments in as simple strings. "
"However, quite often the command-line string should instead be interpreted "
"as another type, such as a :class:`float` or :class:`int`. The ``type`` "
"keyword for :meth:`~ArgumentParser.add_argument` allows any necessary type-"
"checking and type conversions to be performed."
msgstr ""
#: ../../library/argparse.rst:1061
msgid ""
"If the type_ keyword is used with the default_ keyword, the type converter "
"is only applied if the default is a string."
msgstr ""
#: ../../library/argparse.rst:1064
msgid ""
"The argument to ``type`` can be any callable that accepts a single string. "
"If the function raises :exc:`ArgumentTypeError`, :exc:`TypeError`, or "
":exc:`ValueError`, the exception is caught and a nicely formatted error "
"message is displayed. No other exception types are handled."
msgstr ""
#: ../../library/argparse.rst:1069
msgid "Common built-in types and functions can be used as type converters:"
msgstr ""
#: ../../library/argparse.rst:1085
msgid "User defined functions can be used as well:"
msgstr ""
#: ../../library/argparse.rst:1097
msgid ""
"The :func:`bool` function is not recommended as a type converter. All it "
"does is convert empty strings to ``False`` and non-empty strings to "
"``True``. This is usually not what is desired."
msgstr ""
#: ../../library/argparse.rst:1101
msgid ""
"In general, the ``type`` keyword is a convenience that should only be used "
"for simple conversions that can only raise one of the three supported "
"exceptions. Anything with more interesting error-handling or resource "
"management should be done downstream after the arguments are parsed."
msgstr ""
#: ../../library/argparse.rst:1106
msgid ""
"For example, JSON or YAML conversions have complex error cases that require "
"better reporting than can be given by the ``type`` keyword. A "
":exc:`~json.JSONDecodeError` would not be well formatted and a "
":exc:`FileNotFound` exception would not be handled at all."
msgstr ""
#: ../../library/argparse.rst:1111
msgid ""
"Even :class:`~argparse.FileType` has its limitations for use with the "
"``type`` keyword. If one argument uses *FileType* and then a subsequent "
"argument fails, an error is reported but the file is not automatically "
"closed. In this case, it would be better to wait until after the parser has"
" run and then use the :keyword:`with`-statement to manage the files."
msgstr ""
#: ../../library/argparse.rst:1117
msgid ""
"For type checkers that simply check against a fixed set of values, consider "
"using the choices_ keyword instead."
msgstr ""
#: ../../library/argparse.rst:1122
msgid "choices"
msgstr ""
#: ../../library/argparse.rst:1124
msgid ""
"Some command-line arguments should be selected from a restricted set of "
"values. These can be handled by passing a container object as the *choices* "
"keyword argument to :meth:`~ArgumentParser.add_argument`. When the command "
"line is parsed, argument values will be checked, and an error message will "
"be displayed if the argument was not one of the acceptable values::"
msgstr ""
#: ../../library/argparse.rst:1139
msgid ""
"Note that inclusion in the *choices* container is checked after any type_ "
"conversions have been performed, so the type of the objects in the *choices*"
" container should match the type_ specified::"
msgstr ""
#: ../../library/argparse.rst:1151
msgid ""
"Any container can be passed as the *choices* value, so :class:`list` "
"objects, :class:`set` objects, and custom containers are all supported."