如何在OpenTURNS中创建离散分布？

import openturns as ot

distribution = ot.UserDefined([1, 2, 3, 4], [0.1, 0.3, 0.4, 0.2])

distribution.setName("Discrete Distribution")
distribution.setDescription("A user-defined discrete distribution")

# 计算概率质量函数
pmf = distribution.computePMF([1, 2, 3, 4])

# 计算累积分布函数
cdf = distribution.computeCDF([1, 2, 3, 4])

# 绘制概率质量函数图
graph = distribution.drawPDF()

# 绘制累积分布函数图
graph = distribution.drawCDF()