def run_code(code, code_path, ns=None, function_name=None):
    """
    Import a Python module from a path, and run the function given by
    name, if function_name is not None.
    """

    # Change the working directory to the directory of the example, so
    # it can get at its data files, if any.  Add its path to sys.path
    # so it can import any helper modules sitting beside it.
    if six.PY2:
        pwd = os.getcwdu()
    else:
        pwd = os.getcwd()
    old_sys_path = list(sys.path)
    if setup.config.plot_working_directory is not None:
        try:
            os.chdir(setup.config.plot_working_directory)
        except __HOLE__ as err:
            raise OSError(str(err) + '\n`plot_working_directory` option in'
                          'Sphinx configuration file must be a valid '
                          'directory path')
        except TypeError as err:
            raise TypeError(str(err) + '\n`plot_working_directory` option in '
                            'Sphinx configuration file must be a string or '
                            'None')
        sys.path.insert(0, setup.config.plot_working_directory)
    elif code_path is not None:
        dirname = os.path.abspath(os.path.dirname(code_path))
        os.chdir(dirname)
        sys.path.insert(0, dirname)

    # Reset sys.argv
    old_sys_argv = sys.argv
    sys.argv = [code_path]

    # Redirect stdout
    stdout = sys.stdout
    if six.PY3:
        sys.stdout = io.StringIO()
    else:
        sys.stdout = cStringIO.StringIO()

    # Assign a do-nothing print function to the namespace.  There
    # doesn't seem to be any other way to provide a way to (not) print
    # that works correctly across Python 2 and 3.
    def _dummy_print(*arg, **kwarg):
        pass

    try:
        try:
            code = unescape_doctest(code)
            if ns is None:
                ns = {}
            if not ns:
                if setup.config.plot_pre_code is None:
                    six.exec_(six.text_type("import numpy as np\n" +
                    "from matplotlib import pyplot as plt\n"), ns)
                else:
                    six.exec_(six.text_type(setup.config.plot_pre_code), ns)
            ns['print'] = _dummy_print
            if "__main__" in code:
                six.exec_("__name__ = '__main__'", ns)
            code = remove_coding(code)
            six.exec_(code, ns)
            if function_name is not None:
                six.exec_(function_name + "()", ns)
        except (Exception, SystemExit) as err:
            raise PlotError(traceback.format_exc())
    finally:
        os.chdir(pwd)
        sys.argv = old_sys_argv
        sys.path[:] = old_sys_path
        sys.stdout = stdout
    return ns
dataset/ETHPy150Open mwaskom/seaborn/doc/sphinxext/plot_directive.py/run_code