These four categories, and the simple types themselves, were introduced in the first article in this series, "Discover Python, Part 1: Python's built-in numerical types."

Numerical idioms are an important part of the Chinese and English idioms, which reflect Chinese culture and that of the English-speaking countries.

The paper emphasizes on the methods of polynomial surface approximation which is part of numerical approximations, and analyzes the precision of polynomial function model through the measured data.