Here are some example Data Science and Machine Learning applications that leverage Python.

Netflix uses data science to understand user viewing pattern and behavioral drivers. This, in turn, helps Netflix to understand user likes/dislikes and predict and suggest relevant items to view.
Amazon, Walmart, and Target are heavily using data science, data mining and machine learning to understand users preference and shopping behaviour. This assists in both predicting demand to drive inventory management and to suggest relevant products to online users or via email marketing.
Spotify uses data science and machine learning to make music recommendations to its users.
Spam programs are making use of data science and machine learning algorithm(s) to detect and prevent spam emails. visit more