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Find element in selenium based on attribute/value in div class

I'm using selenium in Python to try and scrape multiple pages. ID's and XPATH's keep changing per page, so I figured I'd best access them through their attribute-value combinations (see below).
I'm trying to access the text in the following element:
https://i.stack.imgur.com/ly1YU.png
which belongs to the following:
https://i.stack.imgur.com/strep.png
As I said, the ID's keep changing, so I wanted to access the element by data-fragment-name="articleDetail", or data-testid = "article-body". Can somebody help me how to do so?
Thanks in advance!

Try using the following CSS_SELECTOR
div[data-fragment-name='articleDetail'] div[data-testid='article-body']
Or XPath
//div[#data-fragment-name='articleDetail']//div[#data-testid='article-body']
The Selenium command can look like:
driver.find_element(By.CSS_SELECTOR, "div[data-fragment-name='articleDetail'] div[data-testid='article-body']")
Or
driver.find_element(By.XPATH, "//div[#data-fragment-name='articleDetail']//div[#data-testid='article-body']")

from selenium.webdriver.common.by import By
obj = driver.find_element(By.XPATH, "//div[#data-fragment-name='articleDetail']")
obj2 = driver.find_element(By.XPATH, "//div[#data-testid='article-body']")
where of course driver = webdriver.Firefox() or something like that and you already moved to the desired page.

Selenium unable to find Button

I am trying to click on the "Next Page"-Button on the Web of Science Search-Site to iterate through all pages.
Here is a screenshot of the HTML of the page (highlighted is the button)
This is my code to find the button:
driver.find_element_by_class_name('mat-focus-indicator mat-icon-button mat-button-base').click()
But I receive this error:
NoSuchElementException: Message: no such element: Unable to locate element: {"method":"css selector","selector":".mat-focus-indicator mat-icon-button mat-button-base"}
I have tried so many ways of identifying the button (find_by_id, find_by_name, find_by_link_text) but nothing works.
What am I doing wrong?
Thank you in advance

Maybe try with Query Selector like:
driver.find_element_by_css_selector('button[data-ta="next-page-button"]')
You can always try selectors on elemnts panel (like on screenshort) and type your selector in field "Find by string, css, or xpath"

Class name do not have support for spaces, remove spaces and put . to make it css selector :
driver.find_element_by_css_selector('button.mat-focus-indicator.mat-icon-button.mat-button-base').click()
also try to put some wait before this to make it more consistent.

How to get full X-path of element instance using selenium python

I wanted to get full X-path of element instance using selenium python ?
Input:
element_inst = driver.find_element_by_link_text('Next')
I wanted to get full X-path of element_inst
Sample Output:
/html/body/div[1]/div[6]/div[1]/div[1]/div[1]/content-viewer/div/div/div/div[2]/div[2]/div/activity-viewer/div/div/phase-map-directive/div/div/div/ul/li[3]/div/span[1]
is there any way to print full X-path of element?

Option -1
I found below link which may help you:
https://github.com/seleniumhq/selenium-google-code-issue-archive/issues/5520
Option 2-
You can use Sikuli and record code for below steps and use clipboard data as xpath in your code
Right Click and click on inspect
On selected element just right click
Copy-> Xpath
Hope this helps

no element found even if it was present on the webpage

from selenium import webdriver
browser=webdriver.Firefox()
browser.get("http://dollarupload.com/dl/08c646d60")
browser.find_element_by_id("reg_download").click()
elementlist=browser.find_elements_by_class_name("offer_title")
Actually I was trying to get all the class named offer_title and with that I would like to click the link.But as I can see elementlist is empty.Why?

I think the elements you want are in an iframe to a different page.
If you get the iframe element and try again from there you might have more luck.
elementlist=browser.find_element_by_tag_name("iframe").find_elements_by_class_name("offer_title")

Python selenium test - Facebook code generator XPATH

I'm trying to get the XPATH for Code Generator field form (Facebook) in order to fill it (of course before I need to put a code with "numbers").
In Chrome console when I get the XPATH I get:
//*[#id="approvals_code"]
And then in my test I put:
elem = driver.find_element_by_xpath("//*[#id='approvals_code']")
if elem: elem.send_keys("numbers")
elem.send_keys(Keys.ENTER)
With those I get:
StaleElementReferenceException: Message: stale element reference: element is not attached to the page document
What means wrong field name. Does anyone know how to properly get a XPATH?

This error usually comes if element is not present in the DOM.
Or may be element is in iframe.