Set Attr

gistfile1.txt

        // You can set other product data with $product->setAttributeName() if you want to update more data
        if ($product->getPrice() != $price) {
            $product->setPrice($price) 
                    ->setStoreId(0) // this is needed because if you have multiple store views, each individual store view will get "Use default value" unchecked for multiple attributes - which causes issues.
                    ->save();
        }