*autopct*: [ *None* | format string | format function ]
If not *None*, is a string or function used to label the
wedges with their numeric value. The label will be placed inside
the wedge. If it is a format string, the label will be ``fmt%pct``.
If it is a function, it will be called.
help(pie)
说:因此,可以通过乘以饼图的总大小并除以100,将百分比转换回原始值:
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