Python运行Plotly瀑布图脚本报错：color属性值无效

错误原因分析 #

从报错信息和代码中可以定位两个关键问题：

• 颜色格式非法：waterfall.connector.line.color收到无效值'rgb(63, 63, 63))'，字符串末尾多了一个多余的右括号，不符合Plotly要求的RGB颜色格式规范。
• 列表语法错误：text列表中第三个元素"" "-40"缺少逗号分隔，会触发Python语法解析错误。

修改方案 #

对代码做两处针对性调整：

1. 移除颜色字符串末尾的多余括号，将"rgb(63, 63, 63))"改为"rgb(63, 63, 63)"
2. 在text列表的空字符串和"-40"之间添加逗号，修正列表元素的分隔问题

修改后的完整代码 #

import plotly.graph_objects as go

fig = go.Figure(go.Waterfall(
    name = "20", orientation = "v",
    measure = ["relative", "relative", "total", "relative", "relative", "total"],
    x = ["Sales", "Consulting", "Net revenue", "Purchases", "Other Expenses", "Profit Before Tax"],
    textposition = "outside",
    text = ["+60", "+80", "", "-40", "-20", "Total"],
    y = [60, 80, 0, -40, -20, 0],
    connector = {"line":{"color":"rgb(63, 63, 63)"}},))
    

fig.update_layout(
        title = "Profit and loss statement 2018",
        showlegend = True
)

    
fig.show()

内容的提问来源于stack exchange，提问作者IbraProjects