Method parse

src/_pytest/config/__init__.py:1512–1631

(self, args: list[str], addopts: bool = True)

        return self._inicfg.keys() - known_keys

    def parse(self, args: list[str], addopts: bool = True) -> None:
        # Parse given cmdline arguments into this config object.
        assert self.args == [], (
            "can only parse cmdline args at most once per Config object"
        )

        self.hook.pytest_addhooks.call_historic(
            kwargs=dict(pluginmanager=self.pluginmanager)
        )

        if addopts:
            env_addopts = os.environ.get("PYTEST_ADDOPTS", "")
            if len(env_addopts):
                args[:] = (
                    self._validate_args(shlex.split(env_addopts), "via PYTEST_ADDOPTS")
                    + args
                )

        # At this point, self.option contains only defaults from the _processopt
        # callback.
        ns = self._parser.parse_known_args(args, namespace=copy.copy(self.option))
        rootpath, inipath, inicfg, ignored_config_files = determine_setup(
            inifile=ns.inifilename,
            override_ini=ns.override_ini,
            args=ns.file_or_dir,
            rootdir_cmd_arg=ns.rootdir or None,
            invocation_dir=self.invocation_params.dir,
        )
        self._rootpath = rootpath
        self._inipath = inipath
        self._ignored_config_files = ignored_config_files
        self._inicfg = inicfg
        self._parser.extra_info["rootdir"] = str(self.rootpath)
        self._parser.extra_info["inifile"] = str(self.inipath)

        self._parser.addini("addopts", "Extra command line options", "args")
        self._parser.addini("minversion", "Minimally required pytest version")
        self._parser.addini(
            "pythonpath", type="paths", help="Add paths to sys.path", default=[]
        )
        self._parser.addini(
            "required_plugins",
            "Plugins that must be present for pytest to run",
            type="args",
            default=[],
        )

        if addopts:
            args[:] = (
                self._validate_args(self.getini("addopts"), "via addopts config") + args
            )

        self.known_args_namespace = self._parser.parse_known_args(
            args, namespace=copy.copy(self.option)
        )
        if addopts:
            # addopts may have added overrides (especially via OverrideIniAction).
            # The thing can be endlessly circular but we only do one level (#14442).