def METHOD_NAME(*, root=None, upgrade=False, user=False,
              altinstall=False, default_pip=False,
              verbosity=0):
    """
    Bootstrap pip into the current Python installation (or the given root
    directory).
    Note that calling this function will alter both sys.path and os.environ.
    """
    if altinstall and default_pip:
        raise ValueError("Cannot use altinstall and default_pip together")
    _disable_pip_configuration_settings()
    # By default, installing pip and setuptools installs all of the
    # following scripts (X.Y == running Python version):
    #
    #   pip, pipX, pipX.Y, easy_install, easy_install-X.Y
    #
    # pip 1.5+ allows ensurepip to request that some of those be left out
    if altinstall:
        # omit pip, pipX and easy_install
        os.environ["ENSUREPIP_OPTIONS"] = "altinstall"
    elif not default_pip:
        # omit pip and easy_install
        os.environ["ENSUREPIP_OPTIONS"] = "install"
    with tempfile.TemporaryDirectory() as tmpdir:
        # Put our bundled wheels into a temporary directory and construct the
        # additional paths that need added to sys.path
        additional_paths = []
        for project, version in _PROJECTS:
            wheel_name = "{}-{}-py2.py3-none-any.whl".format(project, version)
            whl = pkgutil.get_data(
                "ensurepip",
                "_bundled/{}".format(wheel_name),
            )
            with open(os.path.join(tmpdir, wheel_name), "wb") as fp:
                fp.write(whl)
            additional_paths.append(os.path.join(tmpdir, wheel_name))
        # Construct the arguments to be passed to the pip command
        args = ["install", "--no-index", "--find-links", tmpdir]
        if root:
            args += ["--root", root]
        if upgrade:
            args += ["--upgrade"]
        if user:
            args += ["--user"]
        if verbosity:
            args += ["-" + "v" * verbosity]
        _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)