Symlog plot in plotly (python)

symlog.py

# Plotly does currently not have a symlog plot built-in, but you can do the symlog
# transformation yourself, plot the data on a linear scale, and adjust the
# ticks and hovertext.
# This script below creates a plot with a symlogged y-axis similar to the second
# plot in the matplotlib demo.
# https://matplotlib.org/stable/gallery/scales/symlog_demo.html

import numpy as np
import plotly.graph_objects as go

dt = 0.01
y = np.arange(-50.0, 50.0, dt)
x = np.arange(0, 100.0, dt)

y_orig = y
y = np.where((y < -1) | (y > 1), np.sign(y) * (1 + np.log10(np.abs(y))), y)

miny = int(np.floor(np.nanmin(y)))
maxy = int(np.ceil(np.nanmax(y)))
tickvals = list(range(miny, maxy+1))

exponents = ['⁰', '¹', '²', '³', '⁴', '⁵', '⁶', '⁷', '⁸', '⁹']
def getticktext(i):
    if i == 0:
        return '0'
    a = abs(i)
    if a == 1:
        return str(i)
    num = '-10' if i < 0 else '10'
    if a > 2:
        num = num + ''.join(exponents[int(i)] for i in str(a-1))
    return num

ticktext = [getticktext(i) for i in tickvals]

fig = go.Figure()
fig.add_trace(
    go.Scatter(
        x=x,
        y=y,
        customdata=y_orig,
        hovertemplate='(%{x}, %{customdata})',
    )
)
fig.update_layout(
    title_text='symlog',
    yaxis={
        'tickvals': tickvals,
        'ticktext': ticktext,
    }
)
fig.show()