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https://github.com/python/cpython
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gh-90300: split --help output into separate options (#30331)
Make --help output shorter and add new help options. --help-env, --help-xoptions and --help-all command-line options are added to complement --help.
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Éric
GitHub
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132e563703
commit
8aa9d40b00
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@ -183,6 +183,8 @@ automatically enabled, if available on your platform (see
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Automatic enabling of tab-completion and history editing.
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.. _using-on-generic-options:
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Generic options
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~~~~~~~~~~~~~~~
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@ -190,8 +192,28 @@ Generic options
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-h
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--help
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Print a short description of all command line options.
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Print a short description of all command line options and corresponding
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environment variables and exit.
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.. cmdoption:: --help-env
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Print a short description of Python-specific environment variables
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and exit.
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.. versionadded:: 3.11
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.. cmdoption:: --help-xoptions
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Print a description of implementation-specific :option:`-X` options
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and exit.
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.. versionadded:: 3.11
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.. cmdoption:: --help-all
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Print complete usage information and exit.
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.. versionadded:: 3.11
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.. cmdoption:: -V
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--version
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@ -212,6 +234,7 @@ Generic options
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.. versionadded:: 3.6
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The ``-VV`` option.
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.. _using-on-misc-options:
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Miscellaneous options
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@ -460,6 +483,7 @@ Miscellaneous options
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See :ref:`warning-filter` and :ref:`describing-warning-filters` for more
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details.
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.. cmdoption:: -x
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Skip the first line of the source, allowing use of non-Unix forms of
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@ -553,6 +577,7 @@ Miscellaneous options
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The ``-X frozen_modules`` option.
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Options you shouldn't use
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~~~~~~~~~~~~~~~~~~~~~~~~~
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@ -25,16 +25,47 @@ def _kill_python_and_exit_code(p):
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returncode = p.wait()
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return data, returncode
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class CmdLineTest(unittest.TestCase):
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def test_directories(self):
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assert_python_failure('.')
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assert_python_failure('< .')
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def verify_valid_flag(self, cmd_line):
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rc, out, err = assert_python_ok(*cmd_line)
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rc, out, err = assert_python_ok(cmd_line)
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self.assertTrue(out == b'' or out.endswith(b'\n'))
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self.assertNotIn(b'Traceback', out)
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self.assertNotIn(b'Traceback', err)
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return out
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def test_help(self):
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self.verify_valid_flag('-h')
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self.verify_valid_flag('-?')
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out = self.verify_valid_flag('--help')
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lines = out.splitlines()
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self.assertIn(b'usage', lines[0])
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self.assertNotIn(b'PYTHONHOME', out)
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self.assertNotIn(b'-X dev', out)
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self.assertLess(len(lines), 50)
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def test_help_env(self):
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out = self.verify_valid_flag('--help-env')
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self.assertIn(b'PYTHONHOME', out)
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def test_help_xoptions(self):
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out = self.verify_valid_flag('--help-xoptions')
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self.assertIn(b'-X dev', out)
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def test_help_all(self):
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out = self.verify_valid_flag('--help-all')
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lines = out.splitlines()
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self.assertIn(b'usage', lines[0])
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self.assertIn(b'PYTHONHOME', out)
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self.assertIn(b'-X dev', out)
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# The first line contains the program name,
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# but the rest should be ASCII-only
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b''.join(lines[1:]).decode('ascii')
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def test_optimize(self):
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self.verify_valid_flag('-O')
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@ -43,14 +74,6 @@ def test_optimize(self):
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def test_site_flag(self):
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self.verify_valid_flag('-S')
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def test_usage(self):
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rc, out, err = assert_python_ok('-h')
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lines = out.splitlines()
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self.assertIn(b'usage', lines[0])
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# The first line contains the program name,
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# but the rest should be ASCII-only
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b''.join(lines[1:]).decode('ascii')
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def test_version(self):
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version = ('Python %d.%d' % sys.version_info[:2]).encode("ascii")
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for switch in '-V', '--version', '-VV':
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@ -90,7 +113,7 @@ def get_xoptions(*args):
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def test_unknown_xoptions(self):
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rc, out, err = assert_python_failure('-X', 'blech')
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self.assertIn(b'Unknown value for option -X', err)
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msg = b'Fatal Python error: Unknown value for option -X'
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msg = b'Fatal Python error: Unknown value for option -X (see --help-xoptions)'
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self.assertEqual(err.splitlines().count(msg), 1)
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self.assertEqual(b'', out)
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@ -134,7 +157,6 @@ def test_xoption_frozen_modules(self):
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}
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for raw, expected in tests:
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cmd = ['-X', f'frozen_modules{raw}',
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#'-c', 'import os; print(os.__spec__.loader.__name__, end="")']
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'-c', 'import os; print(os.__spec__.loader, end="")']
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with self.subTest(raw):
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res = assert_python_ok(*cmd)
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@ -167,7 +189,6 @@ def test_relativedir_bug46421(self):
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# Test `python -m unittest` with a relative directory beginning with ./
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# Note: We have to switch to the project's top module's directory, as per
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# the python unittest wiki. We will switch back when we are done.
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defaultwd = os.getcwd()
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projectlibpath = os.path.dirname(__file__).removesuffix("test")
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with os_helper.change_cwd(projectlibpath):
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# Testing with and without ./
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@ -247,7 +268,6 @@ def test_invalid_utf8_arg(self):
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#
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# Test with default config, in the C locale, in the Python UTF-8 Mode.
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code = 'import sys, os; s=os.fsencode(sys.argv[1]); print(ascii(s))'
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base_cmd = [sys.executable, '-c', code]
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def run_default(arg):
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cmd = [sys.executable, '-c', code, arg]
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@ -892,6 +912,7 @@ def test_sys_flags_not_set(self):
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PYTHONSAFEPATH="1",
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)
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class SyntaxErrorTests(unittest.TestCase):
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def check_string(self, code):
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proc = subprocess.run([sys.executable, "-"], input=code,
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@ -0,0 +1,3 @@
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Make ``--help`` output shorter by moving some info to the new
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``--help-env`` and ``--help-xoptions`` command-line options.
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Also add ``--help-all`` option to print complete usage.
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@ -84,6 +84,19 @@ python \- an interpreted, interactive, object-oriented programming language
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.I never
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]
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.br
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[
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.B \--help
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]
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[
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.B \--help-env
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]
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[
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.B \--help-xoptions
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]
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[
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.B \--help-all
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]
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.br
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[
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.B \-c
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@ -149,6 +162,16 @@ the behavior of the interpreter.
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.B \-h ", " \-? ", "\-\-help
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Prints the usage for the interpreter executable and exits.
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.TP
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.B "\-\-help\-env"
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Prints help about Python-specific environment variables and exits.
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.TP
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.B "\-\-help\-xoptions"
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Prints help about implementation-specific \fB\-X\fP options and exits.
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.TP
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.TP
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.B "\-\-help\-all"
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Prints complete usage information and exits.
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.TP
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.B \-i
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When a script is passed as first argument or the \fB\-c\fP option is
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used, enter interactive mode after executing the script or the
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@ -287,7 +310,7 @@ a regular expression on the warning message.
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.TP
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.BI "\-X " option
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Set implementation specific option. The following options are available:
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Set implementation-specific option. The following options are available:
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-X faulthandler: enable faulthandler
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@ -332,7 +355,7 @@ Set implementation specific option. The following options are available:
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files are desired as well as suppressing the extra visual location indicators
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when the interpreter displays tracebacks.
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-X frozen_modules=[on|off]: whether or not frozen modules should be used
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-X frozen_modules=[on|off]: whether or not frozen modules should be used.
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The default is "on" (or "off" if you are running a local build).
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.TP
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@ -44,8 +44,12 @@ static const wchar_t *opt_ptr = L"";
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#define SHORT_OPTS L"bBc:dEhiIJm:OPqRsStuvVW:xX:?"
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static const _PyOS_LongOption longopts[] = {
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/* name, has_arg, val (used in switch in initconfig.c) */
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{L"check-hash-based-pycs", 1, 0},
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{NULL, 0, 0},
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{L"help-all", 0, 1},
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{L"help-env", 0, 2},
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{L"help-xoptions", 0, 3},
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{NULL, 0, -1}, /* sentinel */
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};
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@ -28,9 +28,10 @@
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static const char usage_line[] =
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"usage: %ls [option] ... [-c cmd | -m mod | file | -] [arg] ...\n";
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/* Long usage message, split into parts < 512 bytes */
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static const char usage_1[] = "\
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Options and arguments (and corresponding environment variables):\n\
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/* Long help message */
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/* Lines sorted by option name; keep in sync with usage_envvars* below */
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static const char usage_help[] = "\
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Options (and corresponding environment variables):\n\
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-b : issue warnings about str(bytes_instance), str(bytearray_instance)\n\
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and comparing bytes/bytearray with str. (-bb: issue errors)\n\
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-B : don't write .pyc files on import; also PYTHONDONTWRITEBYTECODE=x\n\
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@ -39,8 +40,6 @@ Options and arguments (and corresponding environment variables):\n\
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debug builds); also PYTHONDEBUG=x\n\
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-E : ignore PYTHON* environment variables (such as PYTHONPATH)\n\
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-h : print this help message and exit (also -? or --help)\n\
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";
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static const char usage_2[] = "\
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-i : inspect interactively after running script; forces a prompt even\n\
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if stdin does not appear to be a terminal; also PYTHONINSPECT=x\n\
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-I : isolate Python from the user's environment (implies -E and -s)\n\
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@ -53,8 +52,6 @@ static const char usage_2[] = "\
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-q : don't print version and copyright messages on interactive startup\n\
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-s : don't add user site directory to sys.path; also PYTHONNOUSERSITE\n\
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-S : don't imply 'import site' on initialization\n\
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";
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static const char usage_3[] = "\
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-u : force the stdout and stderr streams to be unbuffered;\n\
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this option has no effect on stdin; also PYTHONUNBUFFERED=x\n\
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-v : verbose (trace import statements); also PYTHONVERBOSE=x\n\
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@ -64,55 +61,72 @@ static const char usage_3[] = "\
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-W arg : warning control; arg is action:message:category:module:lineno\n\
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also PYTHONWARNINGS=arg\n\
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-x : skip first line of source, allowing use of non-Unix forms of #!cmd\n\
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-X opt : set implementation-specific option. The following options are available:\n\
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-X faulthandler: enable faulthandler\n\
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-X showrefcount: output the total reference count and number of used\n\
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memory blocks when the program finishes or after each statement in the\n\
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interactive interpreter. This only works on debug builds\n\
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-X tracemalloc: start tracing Python memory allocations using the\n\
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tracemalloc module. By default, only the most recent frame is stored in a\n\
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traceback of a trace. Use -X tracemalloc=NFRAME to start tracing with a\n\
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traceback limit of NFRAME frames\n\
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-X importtime: show how long each import takes. It shows module name,\n\
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cumulative time (including nested imports) and self time (excluding\n\
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nested imports). Note that its output may be broken in multi-threaded\n\
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application. Typical usage is python3 -X importtime -c 'import asyncio'\n\
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-X dev: enable CPython's \"development mode\", introducing additional runtime\n\
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checks which are too expensive to be enabled by default. Effect of the\n\
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developer mode:\n\
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* Add default warning filter, as -W default\n\
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* Install debug hooks on memory allocators: see the PyMem_SetupDebugHooks()\n\
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C function\n\
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* Enable the faulthandler module to dump the Python traceback on a crash\n\
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* Enable asyncio debug mode\n\
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* Set the dev_mode attribute of sys.flags to True\n\
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* io.IOBase destructor logs close() exceptions\n\
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-X utf8: enable UTF-8 mode for operating system interfaces, overriding the default\n\
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locale-aware mode. -X utf8=0 explicitly disables UTF-8 mode (even when it would\n\
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otherwise activate automatically)\n\
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-X pycache_prefix=PATH: enable writing .pyc files to a parallel tree rooted at the\n\
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given directory instead of to the code tree\n\
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-X warn_default_encoding: enable opt-in EncodingWarning for 'encoding=None'\n\
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-X no_debug_ranges: disable the inclusion of the tables mapping extra location \n\
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information (end line, start column offset and end column offset) to every \n\
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instruction in code objects. This is useful when smaller code objects and pyc \n\
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files are desired as well as suppressing the extra visual location indicators \n\
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when the interpreter displays tracebacks.\n\
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-X frozen_modules=[on|off]: whether or not frozen modules should be used.\n\
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The default is \"on\" (or \"off\" if you are running a local build).\n\
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-X opt : set implementation-specific option\n\
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--check-hash-based-pycs always|default|never:\n\
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control how Python invalidates hash-based .pyc files\n\
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";
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static const char usage_4[] = "\
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control how Python invalidates hash-based .pyc files\n\
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--help-env : print help about Python environment variables and exit\n\
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--help-xoptions : print help about implementation-specific -X options and exit\n\
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--help-all : print complete help information and exit\n\
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Arguments:\n\
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file : program read from script file\n\
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- : program read from stdin (default; interactive mode if a tty)\n\
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arg ...: arguments passed to program in sys.argv[1:]\n\n\
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Other environment variables:\n\
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PYTHONSTARTUP: file executed on interactive startup (no default)\n\
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PYTHONPATH : '%lc'-separated list of directories prefixed to the\n\
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default module search path. The result is sys.path.\n\
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arg ...: arguments passed to program in sys.argv[1:]\n\
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";
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static const char usage_5[] =
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static const char usage_xoptions[] = "\
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The following implementation-specific options are available:\n\
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\n\
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-X faulthandler: enable faulthandler\n\
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\n\
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-X showrefcount: output the total reference count and number of used\n\
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memory blocks when the program finishes or after each statement in the\n\
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interactive interpreter. This only works on debug builds\n\
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\n\
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-X tracemalloc: start tracing Python memory allocations using the\n\
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tracemalloc module. By default, only the most recent frame is stored in a\n\
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traceback of a trace. Use -X tracemalloc=NFRAME to start tracing with a\n\
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traceback limit of NFRAME frames\n\
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\n\
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-X importtime: show how long each import takes. It shows module name,\n\
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cumulative time (including nested imports) and self time (excluding\n\
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nested imports). Note that its output may be broken in multi-threaded\n\
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application. Typical usage is python3 -X importtime -c 'import asyncio'\n\
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\n\
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-X dev: enable CPython's \"development mode\", introducing additional runtime\n\
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checks which are too expensive to be enabled by default. Effect of the\n\
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developer mode:\n\
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* Add default warning filter, as -W default\n\
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* Install debug hooks on memory allocators: see the PyMem_SetupDebugHooks()\n\
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C function\n\
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* Enable the faulthandler module to dump the Python traceback on a crash\n\
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* Enable asyncio debug mode\n\
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* Set the dev_mode attribute of sys.flags to True\n\
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* io.IOBase destructor logs close() exceptions\n\
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\n\
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-X utf8: enable UTF-8 mode for operating system interfaces, overriding the default\n\
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locale-aware mode. -X utf8=0 explicitly disables UTF-8 mode (even when it would\n\
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otherwise activate automatically)\n\
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\n\
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-X pycache_prefix=PATH: enable writing .pyc files to a parallel tree rooted at the\n\
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given directory instead of to the code tree\n\
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\n\
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-X warn_default_encoding: enable opt-in EncodingWarning for 'encoding=None'\n\
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\n\
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-X no_debug_ranges: disable the inclusion of the tables mapping extra location \n\
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information (end line, start column offset and end column offset) to every \n\
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instruction in code objects. This is useful when smaller code objects and pyc \n\
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files are desired as well as suppressing the extra visual location indicators \n\
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when the interpreter displays tracebacks.\n\
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\n\
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-X frozen_modules=[on|off]: whether or not frozen modules should be used.\n\
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The default is \"on\" (or \"off\" if you are running a local build).";
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/* Envvars that don't have equivalent command-line options are listed first */
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static const char usage_envvars[] =
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"Environment variables that change behavior:\n"
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"PYTHONSTARTUP: file executed on interactive startup (no default)\n"
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"PYTHONPATH : '%lc'-separated list of directories prefixed to the\n"
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" default module search path. The result is sys.path.\n"
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"PYTHONSAFEPATH: don't prepend a potentially unsafe path to sys.path.\n"
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"PYTHONHOME : alternate <prefix> directory (or <prefix>%lc<exec_prefix>).\n"
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" The default module search path uses %s.\n"
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@ -120,8 +134,7 @@ static const char usage_5[] =
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"PYTHONCASEOK : ignore case in 'import' statements (Windows).\n"
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"PYTHONUTF8: if set to 1, enable the UTF-8 mode.\n"
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"PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.\n"
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"PYTHONFAULTHANDLER: dump the Python traceback on fatal errors.\n";
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static const char usage_6[] =
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"PYTHONFAULTHANDLER: dump the Python traceback on fatal errors.\n"
|
||||
"PYTHONHASHSEED: if this variable is set to 'random', a random value is used\n"
|
||||
" to seed the hashes of str and bytes objects. It can also be set to an\n"
|
||||
" integer in the range [0,4294967295] to get hash values with a\n"
|
||||
|
|
@ -141,7 +154,16 @@ static const char usage_6[] =
|
|||
" tables mapping extra location information (end line, start column offset \n"
|
||||
" and end column offset) to every instruction in code objects. This is useful \n"
|
||||
" when smaller code objects and pyc files are desired as well as suppressing the \n"
|
||||
" extra visual location indicators when the interpreter displays tracebacks.\n";
|
||||
" extra visual location indicators when the interpreter displays tracebacks.\n"
|
||||
"These variables have equivalent command-line parameters (see --help for details):\n"
|
||||
"PYTHONDEBUG : enable parser debug mode (-d)\n"
|
||||
"PYTHONDONTWRITEBYTECODE : don't write .pyc files (-B)\n"
|
||||
"PYTHONINSPECT : inspect interactively after running script (-i)\n"
|
||||
"PYTHONNOUSERSITE : disable user site directory (-s)\n"
|
||||
"PYTHONOPTIMIZE : enable level 1 optimizations (-O)\n"
|
||||
"PYTHONUNBUFFERED : disable stdout/stderr buffering (-u)\n"
|
||||
"PYTHONVERBOSE : trace import statements (-v)\n"
|
||||
"PYTHONWARNINGS=arg : warning control (-W arg)\n";
|
||||
|
||||
#if defined(MS_WINDOWS)
|
||||
# define PYTHONHOMEHELP "<prefix>\\python{major}{minor}"
|
||||
|
|
@ -2084,7 +2106,7 @@ config_read(PyConfig *config, int compute_path_config)
|
|||
/* -X options */
|
||||
const wchar_t* option = _Py_check_xoptions(&config->xoptions, known_xoptions);
|
||||
if (option != NULL) {
|
||||
return PyStatus_Error("Unknown value for option -X");
|
||||
return PyStatus_Error("Unknown value for option -X (see --help-xoptions)");
|
||||
}
|
||||
|
||||
if (config_get_xoption(config, L"showrefcount")) {
|
||||
|
|
@ -2237,15 +2259,32 @@ config_usage(int error, const wchar_t* program)
|
|||
if (error)
|
||||
fprintf(f, "Try `python -h' for more information.\n");
|
||||
else {
|
||||
fputs(usage_1, f);
|
||||
fputs(usage_2, f);
|
||||
fputs(usage_3, f);
|
||||
fprintf(f, usage_4, (wint_t)DELIM);
|
||||
fprintf(f, usage_5, (wint_t)DELIM, PYTHONHOMEHELP);
|
||||
fputs(usage_6, f);
|
||||
fputs(usage_help, f);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
config_envvars_usage()
|
||||
{
|
||||
printf(usage_envvars, (wint_t)DELIM, (wint_t)DELIM, PYTHONHOMEHELP);
|
||||
}
|
||||
|
||||
static void
|
||||
config_xoptions_usage()
|
||||
{
|
||||
puts(usage_xoptions);
|
||||
}
|
||||
|
||||
static void
|
||||
config_complete_usage(const wchar_t* program)
|
||||
{
|
||||
config_usage(0, program);
|
||||
puts("\n");
|
||||
config_envvars_usage();
|
||||
puts("\n");
|
||||
config_xoptions_usage();
|
||||
}
|
||||
|
||||
|
||||
/* Parse the command line arguments */
|
||||
static PyStatus
|
||||
|
|
@ -2297,9 +2336,9 @@ config_parse_cmdline(PyConfig *config, PyWideStringList *warnoptions,
|
|||
}
|
||||
|
||||
switch (c) {
|
||||
// Integers represent long options, see Python/getopt.c
|
||||
case 0:
|
||||
// Handle long option.
|
||||
assert(longindex == 0); // Only one long option now.
|
||||
// check-hash-based-pycs
|
||||
if (wcscmp(_PyOS_optarg, L"always") == 0
|
||||
|| wcscmp(_PyOS_optarg, L"never") == 0
|
||||
|| wcscmp(_PyOS_optarg, L"default") == 0)
|
||||
|
|
@ -2317,6 +2356,21 @@ config_parse_cmdline(PyConfig *config, PyWideStringList *warnoptions,
|
|||
}
|
||||
break;
|
||||
|
||||
case 1:
|
||||
// help-all
|
||||
config_complete_usage(program);
|
||||
return _PyStatus_EXIT(0);
|
||||
|
||||
case 2:
|
||||
// help-env
|
||||
config_envvars_usage();
|
||||
return _PyStatus_EXIT(0);
|
||||
|
||||
case 3:
|
||||
// help-xoptions
|
||||
config_xoptions_usage();
|
||||
return _PyStatus_EXIT(0);
|
||||
|
||||
case 'b':
|
||||
config->bytes_warning++;
|
||||
break;
|
||||
|
|
|
|||
Loading…
Reference in a new issue