Hi Dhwani, you can use following code snippet to select multiple options from a dropdown using python selenium webdriver:
driver=new firefoxdriver();
driver.get('https://www.drivezy.in/')
select = Select(driver.findElement(by.cssSelector("select[multiple='multiple']"))
select.select_by_visible_text("BMW")
select.select_by_visible_text("Saab")
select.select_by_visible_text("Mercedes")
driver.quit()