code: def p_lpartselect_minus(self, p):
          'lpartselect : identifier LBRACKET expression MINUSCOLON expression RBRACKET'
          p[0] = Partselect(p[1], p[3], Minus(p[3], p[5]), lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_lpartselect_minus(self, p):
          'lpartselect : identifier LBRACKET expression MINUSCOLON expression RBRACKET'
          p[0] = Partselect(p[1], p[3], Minus(p[3], p[5]), lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: lpartselect : identifier LBRACKET expression MINUSCOLON expression RBRACKET