object systems, S3 and S4, both of which are available in R. S3 methods are more interactive and flexible, whereas S4 methods are more formal and rigorous. (For an illustration of the two systems, see Thomas

Tarique Siddiqui, Paul Luh, Zesheng Wang, Karrie Karahalios, Aditya G. Parameswaran: ShapeSearch: A Flexible and Efficient System for Shape-based Exploration of Trendlines. SIGMOD 2020  #1.2 Uwe Jugel,

lower-level locks. Power Features link￿ Avoid these features. Definition: Python is an extremely flexible language and gives you many fancy features such as metaclasses, access to bytecode, on-the-fly compilation

arbitrary compile-time computation in the type domain. Template metaprogramming allows extremely flexible interfaces that are type safe and high performance. Facilities like Google Test, std::tuple, std::function