plotly.express line documentation error in line_shape

[abogaard]

Hello, I am trying to pass line_shape='spline' as documented (https://plotly.com/python-api-reference/generated/plotly.express.line.html#plotly.express.line) but am getting the following error:

` Invalid value of type 'builtins.str' received for the 'shape' property of scattergl.line
Received value: 'spline'

The 'shape' property is an enumeration that may be specified as:
  - One of the following enumeration values:
        ['linear', 'hv', 'vh', 'hvh', 'vhv']`

[kevbroch]

I got tripped up by this as well. My workaround was to set render_mode="svg" so plotly.express doesn't try to created a scattergl object like it does when render_mode="auto" is set as the default.

I also tried line_shape="linear"; render_mode="auto", which works fine. So basically one has to decide on performance vs. the line_shape.

I really want splines and also didn't notice that big a difference in the performance. (my plot is probably just over the large size though)

Hoping for a better solution from the plotly team!

[alexcjohnson]

Moving to the plotly.py repo, as there really isn't an issue in plotly.js, it's just the internal logic in px. Perhaps the right solution here is to prevent automatically switching from scatter to scattergl when spline is used? Any other options that scattergl does not support and should prevent switching? I guess another option would be if an error occurs in constructing the final scattergl objects, try switching back to scatter and see if the error disappears; if we get a new error just reraise the original one. Not sure about the performance implications of that, but it would be the most adaptable solution if these conditions change in future plotly.js versions.

[ronak1009]

I am also getting the error after migrating to Python 3.9 and plotly==5.10.0
Error comes for

fig = plx.line(df,x="x", y="y", color="z", 
 labels=labels, 
 width=224, 
 height=245,
 line_shape= "spline" 
)

Error message:

{"logs": ["ERROR: \n    Invalid value of type 'builtins.str' received for the 'shape' property of scattergl.line\n        Received value: 'spline'\n\n 
   The 'shape' property is an enumeration that may be specified as:\n      - One of the following enumeration values:\n            ['linear', 'hv', 'vh', 'hvh', 'vhv']; datasheet.py:641"], "success": false, "time": 0.095167}

Does anyone know work-around to fix this issue ?

[zupdaz]

Getting same error when I load my df from multiple csv.

fig = px.line(df, x='Size_class', y='Value', color='Comment 2', line_shape='spline')
fig.update_xaxes(type="log")