Python 编程: 注释柱状图的数据 Annotate bar chart in Python
用annotate()注释柱状图的数据. 注意参数xy以及xytext的区别。
别忘记了要 textcoords = 'offset points'，把数据点变成当地坐标系的原点。
Use annotate() annotate bar chart. The parameter xy is the data point
and the parameter xytext is the location for the display of the annotation text.
Don't forget to set textcoords = 'offset points'.
It makes the xy data point as the center of the local coordinate.
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