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How to use ensure_pip_os_environ_ok method in tox

Best Python code snippet using tox_python

venv.py

Source:venv.py

...320                    yield opt321            else:322                yield val323        cmd = list(chain.from_iterable(expand(val) for val in self.envconfig.install_command))324        self.ensure_pip_os_environ_ok()325        old_stdout = sys.stdout326        sys.stdout = codecs.getwriter("utf8")(sys.stdout)327        try:328            self._pcall(329                cmd,330                cwd=self.envconfig.config.toxinidir,331                action=action,332                redirect=self.session.report.verbosity < 2,333            )334        finally:335            sys.stdout = old_stdout336    def ensure_pip_os_environ_ok(self):337        for key in ("PIP_RESPECT_VIRTUALENV", "PIP_REQUIRE_VIRTUALENV", "__PYVENV_LAUNCHER__"):338            os.environ.pop(key, None)339        if "PYTHONPATH" not in self.envconfig.passenv:340            # If PYTHONPATH not explicitly asked for, remove it.341            if "PYTHONPATH" in os.environ:342                self.session.report.warning(343                    "Discarding $PYTHONPATH from environment, to override "344                    "specify PYTHONPATH in 'passenv' in your configuration."345                )346                os.environ.pop("PYTHONPATH")347        # installing packages at user level may mean we're not installing inside the venv348        os.environ["PIP_USER"] = "0"349        # installing without dependencies may lead to broken packages350        os.environ["PIP_NO_DEPS"] = "0"...

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