Get the URL node value in Amazon advertising xml in Python

I query the Amazon's product xml, looking for some books' cover to download. The string that i want to extract is located in node which is a child of parent node. How can I do the extraction?

Here is an exmaple xml document: 269b7ade-516d-4516-8293-75dfa8221204 0.0207040000000000 True ISBN 9789004203655 Images Books All 9004203656 A link to an image 75 50 A link to an image 160 107 A link to an image 500 333 A link to an image 30 20 A link to an image 75 50 A link to an image 75 50 A link to an image 110 73 A link to an image 160 107 A link to an image 500 333