The Dropbox client for one is coded in Python, and Dropbox even started their own "improved Python interpreter" project.
Or take Google for example, where Python was (still is for all I know) one of the few officially sanctioned languages: Python, C++, Java (and now Go too -- which, contrary to popular belief hasn't been some kind of exclusive language Google uses, nor has it toppled C++/Java/Python etc from their codebases).
