Unable to locate an element because of timeout in selenium python

I'm trying to finding a way to check if a new page/window is opened successfully and has content or not. I know that selenium is not able to check code 200 to see if the page is successfully loaded or not. So what should I do in order to find out if the page is loaded successfully?

while True:
        try:
            driver.find_element_by_css_selector("#showbtn").click()
            print ("Page Loaded Successfully")
            break
        except:
            print ("Page loading failed")
            time.sleep(5)