Cryptography And Network Security By Forouzan Behrouz A And Debdeep Mukhopadhyay
Q:
How do I get an object into nested divs, via Selenium (Python)?
I'm trying to click on an 'Add to favorites' button on a page, which is inside a div that's inside a div. There are nested divs, and the 'Add to favorites' button is inside a div that's inside another div, etc.
I'm using Selenium, and the web-page is using AJAX to update the DOM in order to show or hide sections.
I want to click the 'Add to favorites' button. I have this working without using Selenium, but I cannot figure out how to get the 'Add to favorites' button within the div, and clicking it. 
So, the following code works:
my_browser = webdriver.Firefox()
my_browser.get('')
my_browser.implicitly_wait(2)
my_browser.switch_to.frame(id='_sidebar')
my_browser.find_element_by_xpath('//div[@id="_favorites-container"]/div/div[@class="_favorites-item"]/a').click()
my_browser.switch_to.default_content()
So, I'm using the find_element_by_xpath method to get to the button.
But when I use the find_element_by_xpath method, in order to get to the button, I don't know how to get to that div within that div, etc. I'd be very grateful for any help you can offer me. 
A:
You can use CSSSelector along with XPath to find the elements on page which are not part of AJAX call and find the element you need. Use find_element_by_css_selector method for the same. If you see the source of the page when you inspect it with Chrome Developer tool, you can easily identify the  elements where the classes are _favorites-container and _favorites-item. Following will find the add to favorites button you're looking for:
my_browser.find_element_by_css_selector("#_favorites-container.
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