The following example in the "Radar chart" [documentation page](https://plotly.com/python/radar-chart/): ```py import plotly.express as px import pandas as pd df = pd.DataFrame(dict( r=[1, 5, 2, 2, 3], theta=['processing cost','mechanical properties','chemical stability', 'thermal stability', 'device integration'])) fig = px.line_polar(df, r='r', theta='theta', line_close=True) fig.show() ``` yields the following error: ``` AttributeError: 'DataFrame' object has no attribute 'append'. Did you mean: '_append'? ``` The reason for this issue is most likely due to the `plotly.express` component not abiding by the [migration guidelines](https://github.com/plotly/plotly.py/blob/master/migration-guide.md#new-figuredata-assignment).