Could we access plotly.js default colors in plotly.py ?

I like very much plotly’s default color scale. However, I am not aware of an official way to reproduce it when I want multiple traces to be of the same color. For now I use the explicit list from https://stackoverflow.com/a/44727682, which I have coded into a function (see below). Is there a recommended way to enforce two traces to be of the same color ? Would you consider including in plotly.py the default color scale ? Thanks

from itertools import cycle

def plotly_color_map(names):
    # From https://stackoverflow.com/a/44727682
    plotly_colors = cycle(['#1f77b4',  # muted blue
                           '#ff7f0e',  # safety orange
                           '#2ca02c',  # cooked asparagus green
                           '#d62728',  # brick red
                           '#9467bd',  # muted purple
                           '#8c564b',  # chestnut brown
                           '#e377c2',  # raspberry yogurt pink
                           '#7f7f7f',  # middle gray
                           '#bcbd22',  # curry yellow-green
                           '#17becf'  # blue-teal
                           ])

    return dict(zip(names, plotly_colors))

[jonmmease]

Turns out this has been in plotly.py all along, but I just learned about it today 🙂

>>> from plotly.colors import DEFAULT_PLOTLY_COLORS
>>> DEFAULT_PLOTLY_COLORS
['rgb(31, 119, 180)',
 'rgb(255, 127, 14)',
 'rgb(44, 160, 44)',
 'rgb(214, 39, 40)',
 'rgb(148, 103, 189)',
 'rgb(140, 86, 75)',
 'rgb(227, 119, 194)',
 'rgb(127, 127, 127)',
 'rgb(188, 189, 34)',
 'rgb(23, 190, 207)']

Can you confirm that this is what you were looking for?

[mwouts]

Hello @jmmease, yes certainly I could import the colorscale from the colorlover package, that would already be more generic than copying/pasting stackoverflow.

I like the colorway layout option, thanks for sharing.

Finally, I would appreciate to simplify the task of giving same colors to traces that have identical names. Would you have recommendations on how to make the below shorter ?

import plotly.graph_objs as go
from plotly.offline import iplot, init_notebook_mode
init_notebook_mode()

cm = plotly_color_map(['trace1', 'trace2']) # function defined in previous post

fig = go.Figure(
    data=[{'y': [1, 2, 3], 'name':'trace1', 'legendgroup':'trace1',
           'line':{'color': cm['trace1']}},
          {'y': [2, 1, 3], 'name':'trace2', 'legendgroup':'trace2',
              'line':{'color': cm['trace2']}},
          {'y': [1, 2, 3], 'name':'trace1', 'legendgroup':'trace1',
              'showlegend':False, 'xaxis':'x2',
           'line':{'color': cm['trace1']}},
          {'y': [1, 3, 2.5], 'name': 'trace2', 'legendgroup': 'trace2',
           'showlegend': False, 'xaxis': 'x2', 'line': {'color': cm['trace2']}}],
    layout={'xaxis': {'domain': [0, .45]},
            'xaxis2': {'domain': [.55, 1]}}
)
iplot(fig)