How to get names of all colorscales in plotly?

Question

I was wondering how to get all the names of available colorscales in plotly in a list.

Wanted:

import plotly
import plotly.offline as py
import plotly.graph_objs as go
import plotly.figure_factory as ff
import plotly.tools as tls
from plotly.offline import plot, iplot, init_notebook_mode
init_notebook_mode(connected=False)

colorscales = plotly.something.something

import plotly.graph_objs as go
x = ['Albania', 'Denmark', 'France', 'Finland', 'USSR']
y = [4, 2, 3, 5, 9]
fig = go.FigureWidget(data=[go.Bar(x=x, y=y,
                                 marker={'color': y,
                                               'colorscale': 'Viridis'})]) 
fig

Here I want to replace 'Viridis' by colorscales[0] and choose whatever colormap it gives.

Answer 1

You can get all the individual colorscale name by using the inspect module while iterating over the known color modules:

import inspect

colorscale_names = []
colors_modules = ['carto', 'colorbrewer', 'cmocean', 'cyclical',
                    'diverging', 'plotlyjs', 'qualitative', 'sequential']
for color_module in colors_modules:
    colorscale_names.extend([name for name, body
                            in inspect.getmembers(getattr(px.colors, color_module))
                            if isinstance(body, list)])

All the names are now available in the list colorscale_names (including those from PLOTLY_SCALES since they are replicated in the color modules). There are some duplicates, which you could remove by casting it to a set.

Here are all the names printed in columns.

from textwrap import fill

print(fill(''.join(sorted({f'{x: <{15}}' for x in colorscale_names})), 75))

Accent         Aggrnyl        Agsunset       Alphabet       Antique
Armyrose       Blackbody      Bluered        Blues          Blugrn
Bluyl          Bold           BrBG           Brwnyl         BuGn
BuPu           Burg           Burgyl         Cividis        D3
Dark2          Dark24         Darkmint       Earth          Edge
Electric       Emrld          Fall           G10            Geyser
GnBu           Greens         Greys          HSV            Hot
IceFire        Inferno        Jet            Light24        Magenta
Magma          Mint           OrRd           Oranges        Oryel
PRGn           Paired         Pastel         Pastel1        Pastel2
Peach          Phase          PiYG           Picnic         Pinkyl
Plasma         Plotly         Plotly3        Portland       Prism
PuBu           PuBuGn         PuOr           PuRd           Purp
Purples        Purpor         Rainbow        RdBu           RdGy
RdPu           RdYlBu         RdYlGn         Redor          Reds
Safe           Set1           Set2           Set3           Spectral
Sunset         Sunsetdark     T10            Teal           Tealgrn
Tealrose       Temps          Tropic         Twilight       Viridis
Vivid          YlGn           YlGnBu         YlOrBr         YlOrRd
algae          amp            balance        curl           deep
delta          dense          gray           haline         ice
matter         mrybm          mygbm          oxy            phase
scale_pairs    scale_sequence solar          speed          tempo
thermal        turbid