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How to use is_allowed_external method in tox

Best Python code snippet using tox_python

_venv.py

Source:_venv.py

...82            raise tox.exception.InvocationError(83                    "could not find executable %r" % (name,))84        # p is not found in virtualenv script/bin dir85        if venv:86            if not self.is_allowed_external(p):87                self.session.report.warning(88                    "test command found but not installed in testenv\n"89                    "  cmd: %s\n"90                    "  env: %s\n"91                    "Maybe forgot to specify a dependency?" % (p,92                    self.envconfig.envdir))93        return str(p) # will not be rewritten for reporting94    def is_allowed_external(self, p):95        tryadd = [""]96        if sys.platform == "win32":97            tryadd += [os.path.normcase(x)98                        for x in os.environ['PATHEXT'].split(os.pathsep)]99            p = py.path.local(os.path.normcase(str(p)))100        for x in self.envconfig.whitelist_externals:101            for add in tryadd:102                if p.fnmatch(x + add):103                    return True104        return False105    def _ispython3(self):106        return "python3" in str(self.envconfig.basepython)107    def update(self, action=None):108        """ return status string for updating actual venv to match configuration....

plugin.py

Source:plugin.py

...81        wheel_package = wheel_build_pep517(config, session, venv)82    else:83        wheel_package = wheel_build_legacy(config, session, venv)84    return wheel_package85def wheel_is_allowed_external(path, venv, is_allowed_external=None):86    if is_allowed_external is None:87        is_allowed_external = venv.is_allowed_external88    if not is_allowed_external(path):89        raise RuntimeError("Couldn't find interpreter inside {} for building".format(venv))90    return True91def wheel_build_legacy(config, session, venv):92    setup = config.setupdir.join("setup.py")93    if not setup.check():94        reporter.error("No setup.py file found. The expected location is: {}".format(setup))95        raise SystemExit(1)96    with session.newaction(venv.name, "packaging") as action:97        with patch(venv, "is_allowed_external", partial(wheel_is_allowed_external, venv=venv)):98            venv.update(action=action)99            if not (session.config.option.wheel_dirty or venv.envconfig.wheel_dirty):100                action.setactivity("wheel-make", "cleaning up build directory ...")101                ensure_empty_dir(config.setupdir.join("build"))102            ensure_empty_dir(config.distdir)...

session.py

Source:session.py

...27        else:28            environ = self._getenv(testcommand=testcommand)29        return action.popen(args, cwd=cwd, env=environ,30                            redirect=redirect, ignore_ret=ignore_ret)31    def is_allowed_external(self, _):32        return True33def main(args=None):34    try:35        config = prepare(args)36        retcode = TaxSession(config).runcommand()37        raise SystemExit(retcode)38    except KeyboardInterrupt:...

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