Must-Have Python Packages for Finance

With the rise in visibility of the extensive use of Python in Finance driven by the recent SEC proposal (PDF) to require that most asset-backed securities issuers file a python computer program to model and document the flow of funds (or waterfall) provisions of the transaction, we thought it timely to ask the "must-have" Python packages for finance would be, so we asked our financial pythonistas to tell us what they thought in a short survey on the topic.