http://www.talkpythontome.com/episodes/show/4/enterprise-python-and-large-scale-projects
A large part of that is based on this Dec 2014 post: https://www.paypal-engineering.com/2014/12/10/10-myths-of-enterprise-python/ which has perhaps 50 or more links.Here is something I had not read before: "Bank of America actually has over 5,000 Python developers, with over 10 million lines of Python in one project alone. JP Morgan underwent a similar transformation."
http://news.efinancialcareers.com/us-en/173476/investment-banking-tech-guru-quits-starts-firm/ https://www.quora.com/When-why-and-to-what-extent-did-Bank-of-America-rebuild-its-entire-tech-stack-with-Python https://www.quora.com/Why-are-banks-like-JP-Morgan-and-Bank-of-America-Merrill-Lynch-using-Python-to-replace-historic-legacy-systems-built-in-Java-C++ -- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list