For all examples in this and the next chapter, we will use Go Playground. Go Playground represents a web service that can run programs written in Go. It can be opened in a web browser using the follow
导读: 人口金字塔(population pyramids)用于展示一个特定人口的年龄和性别分布。本质上是一种水平条形图。左侧是男性的数据,右侧是女性的数据。 Proc Natl Acad Sci U S A.文章《Demographic change and assimilation in the early 21st-century United States》fig 1的人口金字