- Arbitrary precision binary floating point arithmetic [1]
- mpmath, multiple precision arithmetic in Python. The project's home page is here [1] [2]
- The PyMOTW takes a look at the datetime module which provides functions for doing date and time parsing and arithmetic. [1] [2]
- This article discusses IEEE floating point arithmetic in Python including such nastiness as the concepts of infinity (inf) and not-a-number (nan). [1] [2]
- The limitations of floating point arithmetic (IEEE 754) and some of the programming pitfalls that result. [1]