Subplots with Plotly ternary plots

I think I am totally lost when it comes to Plotly Express, Plotly_figure_factory etc.

I cannot figure how to make subplots with Plotly ternary plots out.

First of all, I tried using Plotly Graph Objects, for example I take the ternary plot from ternary scatter plot with Plotly Graph Objects and try to make subplots as detailed here. Putting it all together I end up with

import plotly.graph_objects as go
from plotly.subplots import make_subplots
import plotly.graph_objects as go

rawData = [
    {'journalist':75,'developer':25,'designer':0,'label':'point 1'},
    {'journalist':70,'developer':10,'designer':20,'label':'point 2'},
    {'journalist':75,'developer':20,'designer':5,'label':'point 3'},
    {'journalist':5,'developer':60,'designer':35,'label':'point 4'},
    {'journalist':10,'developer':80,'designer':10,'label':'point 5'},
    {'journalist':10,'developer':90,'designer':0,'label':'point 6'},
    {'journalist':20,'developer':70,'designer':10,'label':'point 7'},
    {'journalist':10,'developer':20,'designer':70,'label':'point 8'},
    {'journalist':15,'developer':5,'designer':80,'label':'point 9'},
    {'journalist':10,'developer':10,'designer':80,'label':'point 10'},
    {'journalist':20,'developer':10,'designer':70,'label':'point 11'},
];

def makeAxis(title, tickangle):
    return {
      'title': {'text': title, 'font': { 'size': 20}},
      'tickangle': tickangle,
      'tickfont': { 'size': 15 },
      'tickcolor': 'rgba(0,0,0,0)',
      'ticklen': 5,
      'showline': True,
      'showgrid': True
    }

fig = go.Figure(go.Scatterternary({
    'mode': 'markers',
    'a': [i for i in map(lambda x: x['journalist'], rawData)],
    'b': [i for i in map(lambda x: x['developer'], rawData)],
    'c': [i for i in map(lambda x: x['designer'], rawData)],
    'text': [i for i in map(lambda x: x['label'], rawData)],
    'marker': {
        'symbol': 100,
        'color': '#DB7365',
        'size': 14,
        'line': { 'width': 2 }
    }
}))

fig.update_layout({
    'ternary': {
        'sum': 100,
        'aaxis': makeAxis('Journalist', 0),
        'baxis': makeAxis('<br>Developer', 45),
        'caxis': makeAxis('<br>Designer', -45)
    },
    'annotations': [{
      'showarrow': False,
      'text': 'Simple Ternary Plot with Markers',
        'x': 0.5,
        'y': 1.3,
        'font': { 'size': 15 }
    }]
})

fig.show()

my_ternary_plot = go.Scatterternary({
    'mode': 'markers',
    'a': [i for i in map(lambda x: x['journalist'], rawData)],
    'b': [i for i in map(lambda x: x['developer'], rawData)],
    'c': [i for i in map(lambda x: x['designer'], rawData)],
    'text': [i for i in map(lambda x: x['label'], rawData)],
    'marker': {
        'symbol': 100,
        'color': '#DB7365',
        'size': 14,
        'line': { 'width': 2 }
    }})

figure = make_subplots(rows=1, cols=2)

figure.add_trace(my_ternary_plot,
    row=1, col=1
)

figure.add_trace(
    my_ternary_plot,
    row=1, col=2
)

figure.update_layout(height=600, width=800, title_text="Side By Side Subplots")
figure.show()

But I get the error

ValueError: Trace type 'scatterternary' is not compatible with subplot type 'xy'
at grid position (1, 1)

See the docstring for the specs argument to plotly.subplots.make_subplots for more information on subplot types

On top of this, I cannot find references to how to get subplots using plotly express plots, e.g. an object like this

data_rand = pd.DataFrame(data=np.random.uniform(0,1,size=((20,4))), columns = ["a","b", "c", "d"])
data_rand["size"] = 35

import plotly.graph_objects as go
import plotly.express as px

plot_ter = px.scatter_ternary(data_rand, a="a", b = "b", c="c",
    color="d", size="size")
fig.show()

I would like to have subplots, not only with plotly.express plots, also containing other matplotlib plots, cannot find any hint anywhere. Is there not a simple way to pass i do not know ax objects to matplotlib figures?

Thank you very much

You need to specify the sublot type(s) when initializing the figure :

By default, the make_subplots function assumes that the traces that will be added to all subplots are 2-dimensional cartesian traces [...]. Traces with other subplot types [...] are supported by specifying the type subplot option via the specs argument.

figure = make_subplots(rows=1, cols=2, 
                       specs=[[{"type": "ternary"}, {"type": "ternary"}]])

Some plotly.express functions are able to create subplots in one call using the facet_* arguments (see Facet Plots). However, at the time of writing, px.scatter_ternary does not provide such arguments.