Solving `'WebElement' object is not subscriptable` in Python
See here for the original answer.
The problem is your use of the find_element method, because afterwords you attempt to access an index of the variable, when it is a single element in length.
What you are looking for is the find_elements command, which will return a list from which you can select individual elements. For more information, see the Selenium documentation on this topic here.