每行代码的意思。 from pyecharts import options as opts from pyecharts.charts import Sankey nodes = [ {"name": "七星关区"}, {"name": "威宁"}, {"name": "金沙"}, {"name": "织金"}, {"name": "黔西"}, {"name": "大方"}, {"name": "纳雍"}, {"name": "赫章"}, {"name": "百管委"}, ] links = [ {"source": "七星关区", "target": "威宁", "value": 577.75}, {"source": "威宁", "target": "金沙", "value": 316.53}, {"source": "金沙", "target": "织金", "value": 263.16}, {"source": "织金", "target": "黔西", "value": 238.91}, {"source": "黔西", "target": "大方", "value": 228.19}, {"source": "大方", "target": "纳雍", "value": 191.03}, {"source": "纳雍", "target": "赫章", "value": 152.61}, {"source": "赫章", "target": "百管委", "value": 46.38}, ] c = ( Sankey() .add( "sankey", nodes, links, linestyle_opt=opts.LineStyleOpts(opacity=0.2, curve=0.5, color="source"), label_opts=opts.LabelOpts(position="right"), ) .set_global_opts(title_opts=opts.TitleOpts(title="2022年毕节各地区GDP")) .render("桑基图.html") )

这段代码主要是利用pyecharts库中的Sankey图表绘制桑基图。首先导入需要的模块，包括Sankey模块和options模块，然后定义了一个节点列表和链接列表，分别表示桑基图中的节点和链接。然后创建了一个Sankey实例对象c，利用add方法添加节点和链接，并设置样式和标签属性。最后调用set_global_opts方法设置全局选项，包括图表标题，最后调用render方法将图表渲染为HTML文件，保存为“桑基图.html”。

相关问题

pyecharts Sankey()调整画布大小

要调整Pyecharts中Sankey图的画布大小，可以通过设置图表的宽度和高度来实现。例如，以下代码演示了如何将Sankey图的宽度设置为800像素，高度设置为600像素：

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

# 构造数据
nodes = [
    {"name": "category1"},
    {"name": "category2"},
    {"name": "category3"},
    {"name": "category4"},
    {"name": "category5"},
]
links = [
    {"source": "category1", "target": "category2", "value": 10},
    {"source": "category2", "target": "category3", "value": 15},
    {"source": "category3", "target": "category4", "value": 20},
    {"source": "category4", "target": "category5", "value": 25},
]

# 绘制Sankey图
sankey = Sankey()
sankey.add("sankey", nodes, links)
sankey.set_global_opts(title_opts=opts.TitleOpts(title="Sankey图", subtitle="示例"))
sankey.set_series_opts(label_opts=opts.LabelOpts(font_size=12))
sankey.set_dimensions(width=800, height=600)
sankey.render("sankey.html")

在上面的代码中，我们通过调用`set_dimensions()`方法来设置Sankey图的宽度和高度。具体来说，我们将宽度设置为800像素，高度设置为600像素。您可以根据需要调整这些值。

python Pyecharts中Sankey图的画布大小

你可以使用 `set_global_opts()` 方法来设置 Sankey 图的画布大小。具体地，可以使用 `width` 和 `height` 参数来设置宽度和高度的大小。例如：

from pyecharts.charts import Sankey

# 创建一个 Sankey 图对象
sankey = Sankey()

# 添加节点和边
sankey.add("sankey", nodes, links, linestyle_opt=opts.LineStyleOpts(opacity=0.2, curve=0.5, color="source"))

# 设置全局配置
sankey.set_global_opts(title_opts=opts.TitleOpts(title="Sankey Diagram", subtitle="Example"),
                       tooltip_opts=opts.TooltipOpts(trigger="item", trigger_on="mousemove|click"),
                       legend_opts=opts.LegendOpts(is_show=False),
                       visualmap_opts=opts.VisualMapOpts(is_piecewise=True,
                                                         pieces=[{"max": 10, "min": 0, "color": "#50a3ba"},
                                                                 {"max": 20, "min": 10, "color": "#eac736"},
                                                                 {"max": 30, "min": 20, "color": "#d94e5d"},
                                                                 {"max": 40, "min": 30, "color": "#b58d8d"},
                                                                 {"max": 50, "min": 40, "color": "#c5ab44"},
                                                                 {"max": 60, "min": 50, "color": "#cd7e7e"},
                                                                 {"max": 70, "min": 60, "color": "#a67c52"}]),
                       label_opts=opts.LabelOpts(position="right"))

# 设置画布大小
sankey.width = "1000px"
sankey.height = "600px"

# 渲染图像
sankey.render("sankey.html")

在上面的代码中，我们通过 `sankey.width` 和 `sankey.height` 来设置 Sankey 图的画布大小，分别为 1000 像素和 600 像素。你可以根据需要进行适当的调整。