def set_conversion(this_converter):
    """
    Set conversion rules in the conversion module.
    :param this_converter: The conversion rules
    :type this_converter: :class:`Converter`
    """
    global converter, py2ri, py2ro, ri2ro, ri2py
    converter = this_converter
    py2ri = converter.py2ri
    py2ro = converter.py2ro
    ri2ro = converter.ri2ro
    ri2py = converter.ri2py
