def p_Bioperation(t): '''Bioperation : Expr PLUS Expr | Expr MINUS Expr | Expr TIMES Expr | Expr DIVIDE Expr | Expr GT Expr | Expr LT Expr | Expr GE Expr | Expr LE Expr | Expr EQ Expr | Expr NE Expr''' t[0] = n.Binop(t[1], t[3], t[2])