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# SOME DESCRIPTIVE TITLE.
# Copyright (C) 2001 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 3.15\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2026-08-09 14:27+0000\n"
"PO-Revision-Date: 2025-09-16 00:00+0000\n"
"Last-Translator: python-doc bot, 2025\n"
"Language-Team: Polish (https://app.transifex.com/python-doc/teams/5390/pl/)\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Language: pl\n"
"Plural-Forms: nplurals=4; plural=(n==1 ? 0 : (n%10>=2 && n%10<=4) && "
"(n%100<12 || n%100>14) ? 1 : n!=1 && (n%10>=0 && n%10<=1) || (n%10>=5 && "
"n%10<=9) || (n%100>=12 && n%100<=14) ? 2 : 3);\n"
msgid "Argparse Tutorial"
msgstr ""
msgid ""
"This tutorial is intended to be a gentle introduction to :mod:`argparse`, "
"the recommended command-line parsing module in the Python standard library."
msgstr ""
msgid ""
"The standard library includes two other libraries directly related to "
"command-line parameter processing: the lower level :mod:`optparse` module "
"(which may require more code to configure for a given application, but also "
"allows an application to request behaviors that ``argparse`` doesn't "
"support), and the very low level :mod:`getopt` (which specifically serves as "
"an equivalent to the :c:func:`!getopt` family of functions available to C "
"programmers). While neither of those modules is covered directly in this "
"guide, many of the core concepts in ``argparse`` first originated in "
"``optparse``, so some aspects of this tutorial will also be relevant to "
"``optparse`` users."
msgstr ""
msgid "Concepts"
msgstr ""
msgid ""
"Let's show the sort of functionality that we are going to explore in this "
"introductory tutorial by making use of the :command:`ls` command:"
msgstr ""
msgid ""
"$ ls\n"
"cpython devguide prog.py pypy rm-unused-function.patch\n"
"$ ls pypy\n"
"ctypes_configure demo dotviewer include lib_pypy lib-python ...\n"
"$ ls -l\n"
"total 20\n"
"drwxr-xr-x 19 wena wena 4096 Feb 18 18:51 cpython\n"
"drwxr-xr-x 4 wena wena 4096 Feb 8 12:04 devguide\n"
"-rwxr-xr-x 1 wena wena 535 Feb 19 00:05 prog.py\n"
"drwxr-xr-x 14 wena wena 4096 Feb 7 00:59 pypy\n"
"-rw-r--r-- 1 wena wena 741 Feb 18 01:01 rm-unused-function.patch\n"
"$ ls --help\n"
"Usage: ls [OPTION]... [FILE]...\n"
"List information about the FILEs (the current directory by default).\n"
"Sort entries alphabetically if none of -cftuvSUX nor --sort is specified.\n"
"..."
msgstr ""
"$ ls\n"
"cpython devguide prog.py pypy rm-unused-function.patch\n"
"$ ls pypy\n"
"ctypes_configure demo dotviewer include lib_pypy lib-python ...\n"
"$ ls -l\n"
"total 20\n"
"drwxr-xr-x 19 wena wena 4096 Feb 18 18:51 cpython\n"
"drwxr-xr-x 4 wena wena 4096 Feb 8 12:04 devguide\n"
"-rwxr-xr-x 1 wena wena 535 Feb 19 00:05 prog.py\n"
"drwxr-xr-x 14 wena wena 4096 Feb 7 00:59 pypy\n"
"-rw-r--r-- 1 wena wena 741 Feb 18 01:01 rm-unused-function.patch\n"
"$ ls --help\n"
"Usage: ls [OPTION]... [FILE]...\n"
"List information about the FILEs (the current directory by default).\n"
"Sort entries alphabetically if none of -cftuvSUX nor --sort is specified.\n"
"..."
msgid "A few concepts we can learn from the four commands:"
msgstr ""
msgid ""
"The :command:`ls` command is useful when run without any options at all. It "
"defaults to displaying the contents of the current directory."
msgstr ""
msgid ""
"If we want beyond what it provides by default, we tell it a bit more. In "
"this case, we want it to display a different directory, ``pypy``. What we "
"did is specify what is known as a positional argument. It's named so because "
"the program should know what to do with the value, solely based on where it "
"appears on the command line. This concept is more relevant to a command "
"like :command:`cp`, whose most basic usage is ``cp SRC DEST``. The first "
"position is *what you want copied,* and the second position is *where you "
"want it copied to*."
msgstr ""
msgid ""
"Now, say we want to change behaviour of the program. In our example, we "
"display more info for each file instead of just showing the file names. The "
"``-l`` in that case is known as an optional argument."
msgstr ""
msgid ""
"That's a snippet of the help text. It's very useful in that you can come "
"across a program you have never used before, and can figure out how it works "
"simply by reading its help text."
msgstr ""
msgid "The basics"
msgstr ""
msgid "Let us start with a very simple example which does (almost) nothing::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.parse_args()"
msgstr ""
msgid "Following is a result of running the code:"
msgstr ""
msgid ""
"$ python prog.py\n"
"$ python prog.py --help\n"
"usage: prog.py [-h]\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
"$ python prog.py --verbose\n"
"usage: prog.py [-h]\n"
"prog.py: error: unrecognized arguments: --verbose\n"
"$ python prog.py foo\n"
"usage: prog.py [-h]\n"
"prog.py: error: unrecognized arguments: foo"
msgstr ""
"$ python prog.py\n"
"$ python prog.py --help\n"
"usage: prog.py [-h]\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
"$ python prog.py --verbose\n"
"usage: prog.py [-h]\n"
"prog.py: error: unrecognized arguments: --verbose\n"
"$ python prog.py foo\n"
"usage: prog.py [-h]\n"
"prog.py: error: unrecognized arguments: foo"
msgid "Here is what is happening:"
msgstr ""
msgid ""
"Running the script without any options results in nothing displayed to "
"stdout. Not so useful."
msgstr ""
msgid ""
"The second one starts to display the usefulness of the :mod:`argparse` "
"module. We have done almost nothing, but already we get a nice help message."
msgstr ""
msgid ""
"The ``--help`` option, which can also be shortened to ``-h``, is the only "
"option we get for free (i.e. no need to specify it). Specifying anything "
"else results in an error. But even then, we do get a useful usage message, "
"also for free."
msgstr ""
msgid "Introducing Positional arguments"
msgstr ""
msgid "An example::"
msgstr "Przykład::"
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"echo\")\n"
"args = parser.parse_args()\n"
"print(args.echo)"
msgstr ""
msgid "And running the code:"
msgstr ""
msgid ""
"$ python prog.py\n"
"usage: prog.py [-h] echo\n"
"prog.py: error: the following arguments are required: echo\n"
"$ python prog.py --help\n"
"usage: prog.py [-h] echo\n"
"\n"
"positional arguments:\n"
" echo\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
"$ python prog.py foo\n"
"foo"
msgstr ""
"$ python prog.py\n"
"usage: prog.py [-h] echo\n"
"prog.py: error: the following arguments are required: echo\n"
"$ python prog.py --help\n"
"usage: prog.py [-h] echo\n"
"\n"
"positional arguments:\n"
" echo\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
"$ python prog.py foo\n"
"foo"
msgid "Here is what's happening:"
msgstr ""
msgid ""
"We've added the :meth:`~ArgumentParser.add_argument` method, which is what "
"we use to specify which command-line options the program is willing to "
"accept. In this case, I've named it ``echo`` so that it's in line with its "
"function."
msgstr ""
msgid "Calling our program now requires us to specify an option."
msgstr ""
msgid ""
"The :meth:`~ArgumentParser.parse_args` method actually returns some data "
"from the options specified, in this case, ``echo``."
msgstr ""
msgid ""
"The variable is some form of 'magic' that :mod:`argparse` performs for free "
"(i.e. no need to specify which variable that value is stored in). You will "
"also notice that its name matches the string argument given to the method, "
"``echo``."
msgstr ""
msgid ""
"Note however that, although the help display looks nice and all, it "
"currently is not as helpful as it can be. For example we see that we got "
"``echo`` as a positional argument, but we don't know what it does, other "
"than by guessing or by reading the source code. So, let's make it a bit more "
"useful::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"echo\", help=\"echo the string you use here\")\n"
"args = parser.parse_args()\n"
"print(args.echo)"
msgstr ""
msgid "And we get:"
msgstr ""
msgid ""
"$ python prog.py -h\n"
"usage: prog.py [-h] echo\n"
"\n"
"positional arguments:\n"
" echo echo the string you use here\n"
"\n"
"options:\n"
" -h, --help show this help message and exit"
msgstr ""
"$ python prog.py -h\n"
"usage: prog.py [-h] echo\n"
"\n"
"positional arguments:\n"
" echo echo the string you use here\n"
"\n"
"options:\n"
" -h, --help show this help message and exit"
msgid "Now, how about doing something even more useful::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"square\", help=\"display a square of a given "
"number\")\n"
"args = parser.parse_args()\n"
"print(args.square**2)"
msgstr ""
msgid ""
"$ python prog.py 4\n"
"Traceback (most recent call last):\n"
" File \"prog.py\", line 5, in <module>\n"
" print(args.square**2)\n"
"TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int'"
msgstr ""
"$ python prog.py 4\n"
"Traceback (most recent call last):\n"
" File \"prog.py\", line 5, in <module>\n"
" print(args.square**2)\n"
"TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int'"
msgid ""
"That didn't go so well. That's because :mod:`argparse` treats the options we "
"give it as strings, unless we tell it otherwise. So, let's tell :mod:"
"`argparse` to treat that input as an integer::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"square\", help=\"display a square of a given "
"number\",\n"
" type=int)\n"
"args = parser.parse_args()\n"
"print(args.square**2)"
msgstr ""
msgid ""
"$ python prog.py 4\n"
"16\n"
"$ python prog.py four\n"
"usage: prog.py [-h] square\n"
"prog.py: error: argument square: invalid int value: 'four'"
msgstr ""
"$ python prog.py 4\n"
"16\n"
"$ python prog.py four\n"
"usage: prog.py [-h] square\n"
"prog.py: error: argument square: invalid int value: 'four'"
msgid ""
"That went well. The program now even helpfully quits on bad illegal input "
"before proceeding."
msgstr ""
msgid "Introducing Optional arguments"
msgstr ""
msgid ""
"So far we have been playing with positional arguments. Let us have a look on "
"how to add optional ones::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"--verbosity\", help=\"increase output verbosity\")\n"
"args = parser.parse_args()\n"
"if args.verbosity:\n"
" print(\"verbosity turned on\")"
msgstr ""
msgid "And the output:"
msgstr ""
msgid ""
"$ python prog.py --verbosity 1\n"
"verbosity turned on\n"
"$ python prog.py\n"
"$ python prog.py --help\n"
"usage: prog.py [-h] [--verbosity VERBOSITY]\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
" --verbosity VERBOSITY\n"
" increase output verbosity\n"
"$ python prog.py --verbosity\n"
"usage: prog.py [-h] [--verbosity VERBOSITY]\n"
"prog.py: error: argument --verbosity: expected one argument"
msgstr ""
msgid ""
"The program is written so as to display something when ``--verbosity`` is "
"specified and display nothing when not."
msgstr ""
msgid ""
"To show that the option is actually optional, there is no error when running "
"the program without it. Note that by default, if an optional argument isn't "
"used, the relevant variable, in this case ``args.verbosity``, is given "
"``None`` as a value, which is the reason it fails the truth test of the :"
"keyword:`if` statement."
msgstr ""
msgid "The help message is a bit different."
msgstr ""
msgid ""
"When using the ``--verbosity`` option, one must also specify some value, any "
"value."
msgstr ""
msgid ""
"The above example accepts arbitrary integer values for ``--verbosity``, but "
"for our simple program, only two values are actually useful, ``True`` or "
"``False``. Let's modify the code accordingly::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"--verbose\", help=\"increase output verbosity\",\n"
" action=\"store_true\")\n"
"args = parser.parse_args()\n"
"if args.verbose:\n"
" print(\"verbosity turned on\")"
msgstr ""
msgid ""
"$ python prog.py --verbose\n"
"verbosity turned on\n"
"$ python prog.py --verbose 1\n"
"usage: prog.py [-h] [--verbose]\n"
"prog.py: error: unrecognized arguments: 1\n"
"$ python prog.py --help\n"
"usage: prog.py [-h] [--verbose]\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
" --verbose increase output verbosity"
msgstr ""
msgid ""
"The option is now more of a flag than something that requires a value. We "
"even changed the name of the option to match that idea. Note that we now "
"specify a new keyword, ``action``, and give it the value ``\"store_true\"``. "
"This means that, if the option is specified, assign the value ``True`` to "
"``args.verbose``. Not specifying it implies ``False``."
msgstr ""
msgid ""
"It complains when you specify a value, in true spirit of what flags actually "
"are."
msgstr ""
msgid "Notice the different help text."
msgstr ""
msgid "Short options"
msgstr ""
msgid ""
"If you are familiar with command line usage, you will notice that I haven't "
"yet touched on the topic of short versions of the options. It's quite "
"simple::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"-v\", \"--verbose\", help=\"increase output "
"verbosity\",\n"
" action=\"store_true\")\n"
"args = parser.parse_args()\n"
"if args.verbose:\n"
" print(\"verbosity turned on\")"
msgstr ""
msgid "And here goes:"
msgstr ""
msgid ""
"$ python prog.py -v\n"
"verbosity turned on\n"
"$ python prog.py --help\n"
"usage: prog.py [-h] [-v]\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
" -v, --verbose increase output verbosity"
msgstr ""
msgid "Note that the new ability is also reflected in the help text."
msgstr ""
msgid "Combining Positional and Optional arguments"
msgstr ""
msgid "Our program keeps growing in complexity::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"square\", type=int,\n"
" help=\"display a square of a given number\")\n"
"parser.add_argument(\"-v\", \"--verbose\", action=\"store_true\",\n"
" help=\"increase output verbosity\")\n"
"args = parser.parse_args()\n"
"answer = args.square**2\n"
"if args.verbose:\n"
" print(f\"the square of {args.square} equals {answer}\")\n"
"else:\n"
" print(answer)"
msgstr ""
msgid "And now the output:"
msgstr ""
msgid ""
"$ python prog.py\n"
"usage: prog.py [-h] [-v] square\n"
"prog.py: error: the following arguments are required: square\n"
"$ python prog.py 4\n"
"16\n"
"$ python prog.py 4 --verbose\n"
"the square of 4 equals 16\n"
"$ python prog.py --verbose 4\n"
"the square of 4 equals 16"
msgstr ""
msgid "We've brought back a positional argument, hence the complaint."
msgstr ""
msgid "Note that the order does not matter."
msgstr ""
msgid ""
"How about we give this program of ours back the ability to have multiple "
"verbosity values, and actually get to use them::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"square\", type=int,\n"
" help=\"display a square of a given number\")\n"
"parser.add_argument(\"-v\", \"--verbosity\", type=int,\n"
" help=\"increase output verbosity\")\n"
"args = parser.parse_args()\n"
"answer = args.square**2\n"
"if args.verbosity == 2:\n"
" print(f\"the square of {args.square} equals {answer}\")\n"
"elif args.verbosity == 1:\n"
" print(f\"{args.square}^2 == {answer}\")\n"
"else:\n"
" print(answer)"
msgstr ""
msgid ""
"$ python prog.py 4\n"
"16\n"
"$ python prog.py 4 -v\n"
"usage: prog.py [-h] [-v VERBOSITY] square\n"
"prog.py: error: argument -v/--verbosity: expected one argument\n"
"$ python prog.py 4 -v 1\n"
"4^2 == 16\n"
"$ python prog.py 4 -v 2\n"
"the square of 4 equals 16\n"
"$ python prog.py 4 -v 3\n"
"16"
msgstr ""
msgid ""
"These all look good except the last one, which exposes a bug in our program. "
"Let's fix it by restricting the values the ``--verbosity`` option can "
"accept::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"square\", type=int,\n"
" help=\"display a square of a given number\")\n"
"parser.add_argument(\"-v\", \"--verbosity\", type=int, choices=[0, 1, 2],\n"
" help=\"increase output verbosity\")\n"
"args = parser.parse_args()\n"
"answer = args.square**2\n"
"if args.verbosity == 2:\n"
" print(f\"the square of {args.square} equals {answer}\")\n"
"elif args.verbosity == 1:\n"
" print(f\"{args.square}^2 == {answer}\")\n"
"else:\n"
" print(answer)"
msgstr ""
msgid ""
"$ python prog.py 4 -v 3\n"
"usage: prog.py [-h] [-v {0,1,2}] square\n"
"prog.py: error: argument -v/--verbosity: invalid choice: 3 (choose from 0, "
"1, 2)\n"
"$ python prog.py 4 -h\n"
"usage: prog.py [-h] [-v {0,1,2}] square\n"
"\n"
"positional arguments:\n"
" square display a square of a given number\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
" -v, --verbosity {0,1,2}\n"
" increase output verbosity"
msgstr ""
msgid ""
"Note that the change also reflects both in the error message as well as the "
"help string."
msgstr ""
msgid ""
"Now, let's use a different approach of playing with verbosity, which is "
"pretty common. It also matches the way the CPython executable handles its "
"own verbosity argument (check the output of ``python --help``)::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"square\", type=int,\n"
" help=\"display the square of a given number\")\n"
"parser.add_argument(\"-v\", \"--verbosity\", action=\"count\",\n"
" help=\"increase output verbosity\")\n"
"args = parser.parse_args()\n"
"answer = args.square**2\n"
"if args.verbosity == 2:\n"
" print(f\"the square of {args.square} equals {answer}\")\n"
"elif args.verbosity == 1:\n"
" print(f\"{args.square}^2 == {answer}\")\n"
"else:\n"
" print(answer)"
msgstr ""
msgid ""
"We have introduced another action, \"count\", to count the number of "
"occurrences of specific options."
msgstr ""
msgid ""
"$ python prog.py 4\n"
"16\n"
"$ python prog.py 4 -v\n"
"4^2 == 16\n"
"$ python prog.py 4 -vv\n"
"the square of 4 equals 16\n"
"$ python prog.py 4 --verbosity --verbosity\n"
"the square of 4 equals 16\n"
"$ python prog.py 4 -v 1\n"
"usage: prog.py [-h] [-v] square\n"
"prog.py: error: unrecognized arguments: 1\n"
"$ python prog.py 4 -h\n"
"usage: prog.py [-h] [-v] square\n"
"\n"
"positional arguments:\n"
" square display a square of a given number\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
" -v, --verbosity increase output verbosity\n"
"$ python prog.py 4 -vvv\n"
"16"
msgstr ""
msgid ""
"Yes, it's now more of a flag (similar to ``action=\"store_true\"``) in the "
"previous version of our script. That should explain the complaint."
msgstr ""
msgid "It also behaves similar to \"store_true\" action."
msgstr ""
msgid ""
"Now here's a demonstration of what the \"count\" action gives. You've "
"probably seen this sort of usage before."
msgstr ""
msgid ""
"And if you don't specify the ``-v`` flag, that flag is considered to have "
"``None`` value."
msgstr ""
msgid ""
"As should be expected, specifying the long form of the flag, we should get "
"the same output."
msgstr ""
msgid ""
"Sadly, our help output isn't very informative on the new ability our script "
"has acquired, but that can always be fixed by improving the documentation "
"for our script (e.g. via the ``help`` keyword argument)."
msgstr ""
msgid "That last output exposes a bug in our program."
msgstr ""
msgid "Let's fix::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"square\", type=int,\n"
" help=\"display a square of a given number\")\n"
"parser.add_argument(\"-v\", \"--verbosity\", action=\"count\",\n"
" help=\"increase output verbosity\")\n"
"args = parser.parse_args()\n"
"answer = args.square**2\n"
"\n"
"# bugfix: replace == with >=\n"
"if args.verbosity >= 2:\n"
" print(f\"the square of {args.square} equals {answer}\")\n"
"elif args.verbosity >= 1:\n"
" print(f\"{args.square}^2 == {answer}\")\n"
"else:\n"
" print(answer)"
msgstr ""
msgid "And this is what it gives:"
msgstr ""
msgid ""
"$ python prog.py 4 -vvv\n"
"the square of 4 equals 16\n"
"$ python prog.py 4 -vvvv\n"
"the square of 4 equals 16\n"
"$ python prog.py 4\n"
"Traceback (most recent call last):\n"
" File \"prog.py\", line 11, in <module>\n"
" if args.verbosity >= 2:\n"
"TypeError: '>=' not supported between instances of 'NoneType' and 'int'"
msgstr ""
msgid ""
"First output went well, and fixes the bug we had before. That is, we want "
"any value >= 2 to be as verbose as possible."
msgstr ""
msgid "Third output not so good."
msgstr ""
msgid "Let's fix that bug::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"square\", type=int,\n"
" help=\"display a square of a given number\")\n"
"parser.add_argument(\"-v\", \"--verbosity\", action=\"count\", default=0,\n"
" help=\"increase output verbosity\")\n"
"args = parser.parse_args()\n"
"answer = args.square**2\n"
"if args.verbosity >= 2:\n"
" print(f\"the square of {args.square} equals {answer}\")\n"
"elif args.verbosity >= 1:\n"
" print(f\"{args.square}^2 == {answer}\")\n"
"else:\n"
" print(answer)"
msgstr ""
msgid ""
"We've just introduced yet another keyword, ``default``. We've set it to "
"``0`` in order to make it comparable to the other int values. Remember that "
"by default, if an optional argument isn't specified, it gets the ``None`` "
"value, and that cannot be compared to an int value (hence the :exc:"
"`TypeError` exception)."
msgstr ""
msgid "And:"
msgstr "I:"
msgid ""
"$ python prog.py 4\n"
"16"
msgstr ""
"$ python prog.py 4\n"
"16"
msgid ""
"You can go quite far just with what we've learned so far, and we have only "
"scratched the surface. The :mod:`argparse` module is very powerful, and "
"we'll explore a bit more of it before we end this tutorial."
msgstr ""
msgid "Getting a little more advanced"
msgstr ""
msgid ""
"What if we wanted to expand our tiny program to perform other powers, not "
"just squares::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"x\", type=int, help=\"the base\")\n"
"parser.add_argument(\"y\", type=int, help=\"the exponent\")\n"
"parser.add_argument(\"-v\", \"--verbosity\", action=\"count\", default=0)\n"
"args = parser.parse_args()\n"
"answer = args.x**args.y\n"
"if args.verbosity >= 2:\n"
" print(f\"{args.x} to the power {args.y} equals {answer}\")\n"
"elif args.verbosity >= 1:\n"
" print(f\"{args.x}^{args.y} == {answer}\")\n"
"else:\n"
" print(answer)"
msgstr ""
msgid "Output:"
msgstr ""
msgid ""
"$ python prog.py\n"
"usage: prog.py [-h] [-v] x y\n"
"prog.py: error: the following arguments are required: x, y\n"
"$ python prog.py -h\n"
"usage: prog.py [-h] [-v] x y\n"
"\n"
"positional arguments:\n"
" x the base\n"
" y the exponent\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
" -v, --verbosity\n"
"$ python prog.py 4 2 -v\n"
"4^2 == 16"
msgstr ""
msgid ""
"Notice that so far we've been using verbosity level to *change* the text "
"that gets displayed. The following example instead uses verbosity level to "
"display *more* text instead::"
msgstr ""
msgid ""
"import argparse\n"
"parser = argparse.ArgumentParser()\n"
"parser.add_argument(\"x\", type=int, help=\"the base\")\n"
"parser.add_argument(\"y\", type=int, help=\"the exponent\")\n"
"parser.add_argument(\"-v\", \"--verbosity\", action=\"count\", default=0)\n"
"args = parser.parse_args()\n"
"answer = args.x**args.y\n"
"if args.verbosity >= 2:\n"
" print(f\"Running '{__file__}'\")\n"
"if args.verbosity >= 1:\n"
" print(f\"{args.x}^{args.y} == \", end=\"\")\n"
"print(answer)"
msgstr ""
msgid ""
"$ python prog.py 4 2\n"
"16\n"
"$ python prog.py 4 2 -v\n"
"4^2 == 16\n"
"$ python prog.py 4 2 -vv\n"
"Running 'prog.py'\n"
"4^2 == 16"
msgstr ""
msgid "Specifying ambiguous arguments"
msgstr ""
msgid ""
"When there is ambiguity in deciding whether an argument is positional or for "
"an argument, ``--`` can be used to tell :meth:`~ArgumentParser.parse_args` "
"that everything after that is a positional argument::"
msgstr ""
msgid ""
">>> parser = argparse.ArgumentParser(prog='PROG')\n"
">>> parser.add_argument('-n', nargs='+')\n"
">>> parser.add_argument('args', nargs='*')\n"
"\n"
">>> # ambiguous, so parse_args assumes it's an option\n"
">>> parser.parse_args(['-f'])\n"
"usage: PROG [-h] [-n N [N ...]] [args ...]\n"
"PROG: error: unrecognized arguments: -f\n"
"\n"
">>> parser.parse_args(['--', '-f'])\n"
"Namespace(args=['-f'], n=None)\n"
"\n"
">>> # ambiguous, so the -n option greedily accepts arguments\n"
">>> parser.parse_args(['-n', '1', '2', '3'])\n"
"Namespace(args=[], n=['1', '2', '3'])\n"
"\n"
">>> parser.parse_args(['-n', '1', '--', '2', '3'])\n"
"Namespace(args=['2', '3'], n=['1'])"
msgstr ""
msgid "Conflicting options"
msgstr ""
msgid ""
"So far, we have been working with two methods of an :class:`argparse."
"ArgumentParser` instance. Let's introduce a third one, :meth:"
"`~ArgumentParser.add_mutually_exclusive_group`. It allows for us to specify "
"options that conflict with each other. Let's also change the rest of the "
"program so that the new functionality makes more sense: we'll introduce the "
"``--quiet`` option, which will be the opposite of the ``--verbose`` one::"
msgstr ""
msgid ""
"import argparse\n"
"\n"
"parser = argparse.ArgumentParser()\n"
"group = parser.add_mutually_exclusive_group()\n"
"group.add_argument(\"-v\", \"--verbose\", action=\"store_true\")\n"
"group.add_argument(\"-q\", \"--quiet\", action=\"store_true\")\n"
"parser.add_argument(\"x\", type=int, help=\"the base\")\n"
"parser.add_argument(\"y\", type=int, help=\"the exponent\")\n"
"args = parser.parse_args()\n"
"answer = args.x**args.y\n"
"\n"
"if args.quiet:\n"
" print(answer)\n"
"elif args.verbose:\n"
" print(f\"{args.x} to the power {args.y} equals {answer}\")\n"
"else:\n"
" print(f\"{args.x}^{args.y} == {answer}\")"
msgstr ""
msgid ""
"Our program is now simpler, and we've lost some functionality for the sake "
"of demonstration. Anyways, here's the output:"
msgstr ""
msgid ""
"$ python prog.py 4 2\n"
"4^2 == 16\n"
"$ python prog.py 4 2 -q\n"
"16\n"
"$ python prog.py 4 2 -v\n"
"4 to the power 2 equals 16\n"
"$ python prog.py 4 2 -vq\n"
"usage: prog.py [-h] [-v | -q] x y\n"
"prog.py: error: argument -q/--quiet: not allowed with argument -v/--verbose\n"
"$ python prog.py 4 2 -v --quiet\n"
"usage: prog.py [-h] [-v | -q] x y\n"
"prog.py: error: argument -q/--quiet: not allowed with argument -v/--verbose"
msgstr ""
msgid ""
"That should be easy to follow. I've added that last output so you can see "
"the sort of flexibility you get, i.e. mixing long form options with short "
"form ones."
msgstr ""
msgid ""
"Before we conclude, you probably want to tell your users the main purpose of "
"your program, just in case they don't know::"
msgstr ""
msgid ""
"import argparse\n"
"\n"
"parser = argparse.ArgumentParser(description=\"calculate X to the power of "
"Y\")\n"
"group = parser.add_mutually_exclusive_group()\n"
"group.add_argument(\"-v\", \"--verbose\", action=\"store_true\")\n"
"group.add_argument(\"-q\", \"--quiet\", action=\"store_true\")\n"
"parser.add_argument(\"x\", type=int, help=\"the base\")\n"
"parser.add_argument(\"y\", type=int, help=\"the exponent\")\n"
"args = parser.parse_args()\n"
"answer = args.x**args.y\n"
"\n"
"if args.quiet:\n"
" print(answer)\n"
"elif args.verbose:\n"
" print(f\"{args.x} to the power {args.y} equals {answer}\")\n"
"else:\n"
" print(f\"{args.x}^{args.y} == {answer}\")"
msgstr ""
msgid ""
"Note that slight difference in the usage text. Note the ``[-v | -q]``, which "
"tells us that we can either use ``-v`` or ``-q``, but not both at the same "
"time:"
msgstr ""
msgid ""
"$ python prog.py --help\n"
"usage: prog.py [-h] [-v | -q] x y\n"
"\n"
"calculate X to the power of Y\n"
"\n"
"positional arguments:\n"
" x the base\n"
" y the exponent\n"
"\n"
"options:\n"
" -h, --help show this help message and exit\n"
" -v, --verbose\n"
" -q, --quiet"
msgstr ""
msgid "How to translate the argparse output"