pyecharts桑基图节点颜色

在pyecharts中，可以通过 `Node.color` 属性来设置桑基图节点的颜色。以下是一个简单的示例代码：

from pyecharts import options as opts
from pyecharts.charts import Sankey

nodes = [
    {"name": "A"},
    {"name": "B"},
    {"name": "C"},
    {"name": "D"},
]
links = [
    {"source": "A", "target": "B", "value": 10},
    {"source": "B", "target": "C", "value": 15},
    {"source": "C", "target": "D", "value": 20},
]

sankey = (
    Sankey()
    .add("sankey", nodes, links, 
         linestyle_opt=opts.LineStyleOpts(opacity=0.2, curve=0.5, color="source"),
         label_opts=opts.LabelOpts(position="right", font_size=12),
         node_gap=20, node_width=25,
         )
    .set_global_opts(title_opts=opts.TitleOpts(title="Basic Sankey Diagram"))
)

# 设置节点颜色
sankey.nodes[0].color = "#FF0000"
sankey.nodes[1].color = "#00FF00"
sankey.nodes[2].color = "#0000FF"
sankey.nodes[3].color = "#FF00FF"

sankey.render("sankey.html")

在上面的代码中，我们设置了每个节点的颜色，分别为红色、绿色、蓝色和紫色。可以根据实际需求调整节点颜色。