Python有一个很好的统计推断包。那就是scipy里面的stats。
Scipy的stats模块包含了多种概率分布的随机变量，随机变量分为连续的和离散的两种。
所有的连续随机变量都是rv_continuous的派生类的对象，而所有的离散随机变量都是 rv_discrete的派生类的对象。
This module contains a large number of probability distributions as well as a growing library of statistical functions.
Each univariate distribution is an instance of a subclass of rv_continuous(rv_discrete for discrete distributions):
参考：
- 统计函数库scipy.stats