This is a quote from the manual here:
I think it is not the actual behaviour, since when I pass in a df.index with dtype=PeriodIndex, which I consider as a valid pandas date format, it throws an exception about PeriodIndex is not possible to JSON Serialise.
Sure I can go like df.index = df.index.astype(str)
Then do the: fig = px.line(df, x=df.index, y=(col2), title=‘Whatever’)
But this conversion step is what should be avoided in the first place I think. Plotly should be able to read out a PeriodIndex.
Any way to make this work without conversion?