Can't plot cones in dash

Dash Python
1

Using plotly 2.7.0, which has support for cones (https://plot.ly/python/3d-cone/), I’m trying to generate a mesh of cones on a sphere. I can generate the mesh in jupyter or ipython, however I get the traceback below when running in dash. For simplicity, I am only attempting to plot one cone below.

Is it expected that cones do not plot in dash?

import dash
from dash.dependencies import Input, Output, Event, State
import dash_core_components as dcc
import dash_html_components as html
import dash_table_experiments as dt
import plotly.graph_objs as go

app=dash.Dash()
app.scripts.config.serve_locally=True

server=app.server

app.layout=html.Div([
    html.Div([
        html.H1('Brownian Motion on the Unit Sphere'),
        html.H5('Warning, do not refresh the page or all data will be lost!'),
    ],className = 'container'),

    html.Button('Click to plot cone', id = 'plot_cone'),

    # 3d chart
    html.Div([
        html.Div([
            dcc.Graph(id='plot-3d-cone', style={'height': 600, 'align': 'center'},className='twelve columns')
        ],className='row')
    ],className='container'),

])

@app.callback(
    Output('plot-3d-cone', 'figure'),
    [Input('plot_cone', 'n_clicks')],
)
def plot_cone(n_clicks):
    cone = dict(
        type='cone',
        x=[1],
        y=[1],
        z=[1],
        u=[1],
        v=[0],
        w=[0]
    )

    # Set the layout
    noaxis=dict(showbackground=False,
                  showgrid=False,
                  showline=True,
                  showticklabels=True,
                  ticks='',
                  title='',
                  zeroline=False)

    layout3d=go.Layout(title='Brownian Motion on Unit Sphere',
            font=dict(family='Balto', size=14),
        )

    fig=go.Figure(dict(data=[cone], layout=layout3d))

    return fig

Traceback
[2018-06-19 13:31:10,327] ERROR in app: Exception on /_dash-update-component [POST]
Traceback (most recent call last):
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/flask/app.py”, line 2292, in wsgi_app
response = self.full_dispatch_request()
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/flask/app.py”, line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/flask/app.py”, line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/flask/_compat.py”, line 35, in reraise
raise value
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/flask/app.py”, line 1813, in full_dispatch_request
rv = self.dispatch_request()
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/flask/app.py”, line 1799, in dispatch_request
return self.view_functionsrule.endpoint
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/dash/dash.py”, line 558, in dispatch
return self.callback_map[target_id]‘callback’
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/dash/dash.py”, line 515, in add_context
output_value = func(*args, **kwargs)
File “/network/rit/home/ns742711/schiraldilab/repos/earle-viz/test.py”, line 58, in plot_cone
fig=go.Figure(dict(data=[cone], layout=layout3d))
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/plotly/graph_objs/graph_objs.py”, line 1175, in init
super(Figure, self).init(*args, **kwargs)
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/plotly/graph_objs/graph_objs.py”, line 377, in init
self.setitem(key, val, _raise=_raise)
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/plotly/graph_objs/graph_objs.py”, line 432, in setitem
value = self._value_to_graph_object(key, value, _raise=_raise)
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/plotly/graph_objs/graph_objs.py”, line 543, in _value_to_graph_object
_parent=self, _parent_key=key)
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/plotly/graph_objs/graph_objs.py”, line 793, in create
return globals()[class_name](*args, **kwargs)
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/plotly/graph_objs/graph_objs.py”, line 158, in init
value = self._value_to_graph_object(index, value, _raise=_raise)
File “/network/rit/lab/schiraldilab/bin/anaconda3/lib/python3.6/site-packages/plotly/graph_objs/graph_objs.py”, line 1073, in _value_to_graph_object
raise exceptions.PlotlyDataTypeError(self, path)
plotly.exceptions.PlotlyDataTypeError: Invalid entry found in ‘data’ at index, ‘0’

Path To Error: [‘data’][0]

It’s invalid because it doesn’t contain a valid ‘type’ value.

Conda list
# packages in environment at /network/rit/lab/schiraldilab/bin/anaconda3:
#
# Name Version Build Channel
plotly 2.7.0 py36_1

2

This is very weird… I prefer to use plotly.graph_objs, and found that it should be able to make cones (https://plot.ly/python/reference/#cone), yet looking through the source code for my graph_objs, there is no defined class Cone…?
So the documentation states that cones should be supported, but it is not anywhere in the package (or in mine at least). Fingers crossed a plotly expert will stumble by this somehow. :thinking:

3

:wave:

These classes are dynamically generated, which is why you don’t find the source code (that will change soon in plotly.py 3.0.0: https://github.com/plotly/plotly.py/pull/942).

For now, you can workaroudn this issue by not using the graph_objs. graph_objs are 1-1 with dict, so you can just do dict(type='cone', x=..., y=..., z=...)

4

Thanks @chriddyp. I am on the correct dash_core_components version but am still receiving the traceback as noted above in the simple example, which basically boils down to:

Path To Error: [‘data’][0]

It’s invalid because it doesn’t contain a valid ‘type’ value.

I’ll keep digging around to see if I’m generating something incorrectly, but the dict(type=‘cone’) doesn’t seem to work either.

dash 0.21.1
dash-core-components 0.23.0
dash-html-components 0.11.0
dash-renderer 0.13.0
dash-table-experiments 0.6.0

5

Thanks for reporting @wxnick! If you open up your browser’s console and type:

Plotly.version

what gets printed out? For me, it looks like:
image

6

@chriddyp I’m seeing

plotly.version
“1.38.0”

7

Just to make sure we’re all testing the same thing, this is the version that should be working.

Note: not only is there no go.Cone, but graph_objs aren’t being used for the figure or layout either.

import dash
from dash.dependencies import Input, Output, Event, State
import dash_core_components as dcc
import dash_html_components as html
import dash_table_experiments as dt
import plotly.graph_objs as go

app = dash.Dash()
app.scripts.config.serve_locally = True

server = app.server

app.layout = html.Div([
    html.Div([
        html.H1('Brownian Motion on the Unit Sphere'),
        html.H5('Warning, do not refresh the page or all data will be lost!'),
    ], className='container'),

    html.Button('Click to plot cone', id='plot_cone'),

    # 3d chart
    html.Div([
        html.Div([
            dcc.Graph(id='plot-3d-cone', style={'height': 600,
                                                'align': 'center'}, className='twelve columns')
        ], className='row')
    ], className='container'),

])


@app.callback(
    Output('plot-3d-cone', 'figure'),
    [Input('plot_cone', 'n_clicks')],
)
def plot_cone(n_clicks):
    cone = dict(
        type='cone',
        x=[1],
        y=[1],
        z=[1],
        u=[1],
        v=[0],
        w=[0]
    )

    # Set the layout
    noaxis = dict(showbackground=False,
                  showgrid=False,
                  showline=True,
                  showticklabels=True,
                  ticks='',
                  title='',
                  zeroline=False)

    layout3d = dict(title='Brownian Motion on Unit Sphere',
                    font=dict(family='Balto', size=14))

    fig = dict(data=[cone], layout=layout3d)

    return fig


if __name__ == '__main__':
    app.run_server()
1 Like
8

That’s right, I didn’t strip out the unused imports.