Here are a couple of use cases :<p>* Lets say you are Google and you want to test if the site is working correctly every day. You could code up a Python script that opens up www.google.com, searches for &quot;facebook&quot; and makes sure that the first result points to www.facebook.com. This script can be configured to run everyday and if someone accidentally pushes an update to the site that causes www.facebook.com to not show up as the top result, the script automatically reverts the site back to its original state. This means users continue to get best search results even if an engineer made a mistake with the ranking algorithm.<p>* Lets say you are Ebay and you want to make sure that the prices for products on your site is competitive with those at Amazon. You can code up a Python script which searches for some products that customers regularly buy, like an iPhone, and extract the lowest offered price at Amazon. It can then compare them with the lowest offered price of an iPhone on Ebay. If the lowest offered price on Ebay is much larger than that at Amazon, you can offer a discount. This convinces the customer that they are getting competitive offers from Ebay and stops them from writing off Ebay when they want to shop online.