def strBool(bool_str):
    """
    Take the string "true" or "false" of any case and return a 
    boolean object.
    """
    
    if bool_str.lower() == "true":
        return True
    elif bool_str.lower() == "false":
        return False
    else:
        raise Exception(
            "argument for strBool must be string either 'True' or 'False'.")