def engineering_notation_number(obj):
    r"""
    Validate if an object is an :ref:`EngineeringNotationNumber` pseudo-type object.

    :param obj: Object
    :type  obj: any

    :raises: RuntimeError (Argument \`*[argument_name]*\` is not valid). The
     token \*[argument_name]\* is replaced by the name of the argument the
     contract is attached to

    :rtype: None
    """
    try:
        obj = obj.rstrip()
        float(obj[:-1] if obj[-1] in _SUFFIX_TUPLE else obj)
        return None
    except (AttributeError, IndexError, ValueError):
        # AttributeError: obj.rstrip(), object could not be a string
        # IndexError: obj[-1], when an empty string
        # ValueError: float(), when not a string representing a number
        raise ValueError(pexdoc.pcontracts.get_exdesc())
r"""
    Validate if an object is an :ref:`EngineeringNotationNumber` pseudo-type object.

    :param obj: Object
    :type  obj: any

    :raises: RuntimeError (Argument \`*[argument_name]*\` is not valid). The
     token \*[argument_name]\* is replaced by the name of the argument the
     contract is attached to

    :rtype: None