我想用pyecharts写一个5个层级的桑基图，请给我一个示例，节点与节点关系随机就行。

好的，以下是一个5层级的随机桑基图的示例代码：

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

nodes = [
    {"name": "A1"},
    {"name": "B1"},
    {"name": "B2"},
    {"name": "C1"},
    {"name": "C2"},
    {"name": "D1"},
    {"name": "D2"},
    {"name": "E1"},
    {"name": "E2"},
]

links = [
    {"source": "A1", "target": "B1", "value": 10},
    {"source": "A1", "target": "B2", "value": 5},
    {"source": "B1", "target": "C1", "value": 8},
    {"source": "B1", "target": "C2", "value": 2},
    {"source": "B2", "target": "C1", "value": 3},
    {"source": "B2", "target": "C2", "value": 2},
    {"source": "C1", "target": "D1", "value": 6},
    {"source": "C1", "target": "D2", "value": 2},
    {"source": "C2", "target": "D1", "value": 4},
    {"source": "C2", "target": "D2", "value": 1},
    {"source": "D1", "target": "E1", "value": 5},
    {"source": "D1", "target": "E2", "value": 1},
    {"source": "D2", "target": "E1", "value": 3},
    {"source": "D2", "target": "E2", "value": 1},
]

sankey = (
    Sankey()
    .add(
        series_name="",
        nodes=nodes,
        links=links,
        itemstyle_opts=opts.ItemStyleOpts(border_width=1, border_color="#aaa"),
        linestyle_opt=opts.LineStyleOpts(curve=0.5),
    )
    .set_global_opts(title_opts=opts.TitleOpts(title="5层级随机桑基图"))
)

sankey.render("5_level_sankey.html")

这段示例代码会生成一个5层级的随机桑基图，并将其保存为"5_level_sankey.html"文件。你可以自己修改节点和节点之间的关系来生成不同的图表。