How to use the mccabe.McCabeChecker function in mccabe

def lint_mccabe(filename, tree, threshold=7):
    """
    Lint file with mccabe complexity check.
    """
    mccabe.McCabeChecker.max_complexity = threshold
    checker = mccabe.McCabeChecker(tree, filename)

    return ((err[0], err[1], err[2]) for err in checker.run())

# lint with import order
        if settings.get('import_order', False):
            order_style = settings.get('import_order_style')
            import_linter = ImportOrderLinter(tree, None, lines, order_style)
            for error in import_linter.run():
                warnings.append(error[0:3])

        # check complexity
        try:
            complexity = int(settings.get('complexity', -1))
        except (TypeError, ValueError):
            complexity = -1

        if complexity > -1:
            mccabe.McCabeChecker.max_complexity = complexity
            checker = mccabe.McCabeChecker(tree, None)
            for error in checker.run():
                warnings.append(error[0:3])

    return sorted(warnings, key=lambda e: '{0:09d}{1:09d}'.format(e[0], e[1]))

def run(path, code=None, params=None, **meta):
        """MCCabe code checking.

        :return list: List of errors.
        """
        tree = compile(code, path, "exec", ast.PyCF_ONLY_AST)

        McCabeChecker.max_complexity = int(params.get('complexity', 10))
        return [
            {'lnum': lineno, 'offset': offset, 'text': text, 'type': McCabeChecker._code}
            for lineno, offset, text, _ in McCabeChecker(tree, path).run()
        ]

def get_code_complexity(code, threshold=7, filename='stdin'):
    """
    This is a monkey-patch for flake8.pyflakes.check.
    Return array of errors instead of print them into STDERR.
    """
    try:
        tree = compile(code, filename, "exec", ast.PyCF_ONLY_AST)
    except SyntaxError:
        # return [(value.lineno, value.offset, value.args[0])]
        # be silent when error, or else syntax errors are reported twice
        return []

    complexity = []
    McCabeChecker.max_complexity = threshold
    for lineno, offset, text, check in McCabeChecker(tree, filename).run():
        complexity.append((lineno, offset, text))
    return complexity