source = pd.DataFrame(
{"category": ["a", "b", "c", "d", "e", "f"], "value": [4, 6, 10, 3, 7, 8]}
)
base = alt.Chart(source).encode(
theta=alt.Theta("value:Q", stack=True), color=alt.Color("category:N", legend=None)
)
pie = base.mark_arc(outerRadius=120)
text = base.mark_text(radius=140, size=20).encode(text="value:Q")
现在的图形标签是单纯的数字,我想把每个标签变成:“a是4,占比为10.5%”的样式,要怎么改代码呢?
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