Python Service Objects

Python Service Objects (PSO) is a software package for the Python programming language that simplifies HTTP handlers. PSO was developed by Thanos Vassilakis in 1996, and was used for a series of first-generation internet casinos, including Caesars Palace, Can-Can, and LuckyNumbers.

Later, it was used for the New York Stock Exchange's first internet-based service, the Specialist Portfolio (SPF 1998). SPF became the NYSE's third mainstream trading service.