Example "Update Button" is broken in: Python > Custom Controls > Custom Buttons

The code in the example doesn't correctly import the dataset, namely the Data column that is supposed to be index is imported as ordinary column making the following code disfunction in several places.

The fix is to put the line df = df.set_index('Date') just after reading the dataframe:

...
df = pd.read_csv(
    "https://raw.githubusercontent.com/plotly/datasets/master/finance-charts-apple.csv")
df = df.set_index('Date')
...

Cheers.

从 Python > Custom Controls > Custom Buttons 示例开始，检查 pd.read_csv 附近的数据框加载代码。验证 Date 列是否被用作数据框索引，然后运行示例并确认 Update Button 在受影响的位置正常工作。