How to use the jupyterlab.jupyterlab.semver.Range function in jupyterlab

def _compare_ranges(spec1, spec2):
    """Test whether two version specs overlap.

    Returns `None` if we cannot determine compatibility,
    otherwise return 0 if there is an overlap, 1 if
    spec1 is lower/older than spec2, and -1 if spec1
    is higher/newer than spec2.
    """
    # Test for overlapping semver ranges.
    r1 = Range(spec1, True)
    r2 = Range(spec2, True)

    # If either range is empty, we cannot verify.
    if not r1.range or not r2.range:
        return

    x1 = r1.set[0][0].semver
    x2 = r1.set[0][-1].semver
    y1 = r2.set[0][0].semver
    y2 = r2.set[0][-1].semver

    o1 = r1.set[0][0].operator
    o2 = r2.set[0][0].operator

    # We do not handle (<) specifiers.
    if (o1.startswith('<') or o2.startswith('<')):

def _format_compatibility_errors(name, version, errors):
    """Format a message for compatibility errors.
    """
    msgs = []
    l0 = 10
    l1 = 10
    for error in errors:
        pkg, jlab, ext = error
        jlab = str(Range(jlab, True))
        ext = str(Range(ext, True))
        msgs.append((pkg, jlab, ext))
        l0 = max(l0, len(pkg) + 1)
        l1 = max(l1, len(jlab) + 1)

    msg = '\n"%s@%s" is not compatible with the current JupyterLab'
    msg = msg % (name, version)
    msg += '\nConflicting Dependencies:\n'
    msg += 'JupyterLab'.ljust(l0)
    msg += 'Extension'.ljust(l1)
    msg += 'Package\n'

    for (pkg, jlab, ext) in msgs:
        msg += jlab.ljust(l0) + ext.ljust(l1) + pkg + '\n'

    return msg

def _format_compatibility_errors(name, version, errors):
    """Format a message for compatibility errors.
    """
    msgs = []
    l0 = 10
    l1 = 10
    for error in errors:
        pkg, jlab, ext = error
        jlab = str(Range(jlab, True))
        ext = str(Range(ext, True))
        msgs.append((pkg, jlab, ext))
        l0 = max(l0, len(pkg) + 1)
        l1 = max(l1, len(jlab) + 1)

    msg = '\n"%s@%s" is not compatible with the current JupyterLab'
    msg = msg % (name, version)
    msg += '\nConflicting Dependencies:\n'
    msg += 'JupyterLab'.ljust(l0)
    msg += 'Extension'.ljust(l1)
    msg += 'Package\n'

    for (pkg, jlab, ext) in msgs:
        msg += jlab.ljust(l0) + ext.ljust(l1) + pkg + '\n'

    return msg

def _compare_ranges(spec1, spec2):
    """Test whether two version specs overlap.

    Returns `None` if we cannot determine compatibility,
    otherwise return 0 if there is an overlap, 1 if
    spec1 is lower/older than spec2, and -1 if spec1
    is higher/newer than spec2.
    """
    # Test for overlapping semver ranges.
    r1 = Range(spec1, True)
    r2 = Range(spec2, True)

    # If either range is empty, we cannot verify.
    if not r1.range or not r2.range:
        return

    x1 = r1.set[0][0].semver
    x2 = r1.set[0][-1].semver
    y1 = r2.set[0][0].semver
    y2 = r2.set[0][-1].semver

    o1 = r1.set[0][0].operator
    o2 = r2.set[0][0].operator

    # We do not handle (<) specifiers.
    if (o1.startswith('<') or o2.startswith('<')):
        return