def _part(string):
if string == '<STR_LIT:I>':<EOL><INDENT>return <NUM_LIT:1><EOL><DEDENT>elif string == '<STR_LIT>':<EOL><INDENT>return <NUM_LIT:2><EOL><DEDENT>elif string == '<STR_LIT>':<EOL><INDENT>return <NUM_LIT:3><EOL><DEDENT>elif string == '<STR_LIT>':<EOL><INDENT>return <NUM_LIT:4><EOL><DEDENT>
Transform a part string (I, II or III) into an integer