[python] Method to darken RGB value in hexadecimal notation


def darken(rgb, rate=0.5):
    rgb = rgb.replace('#', '')
    s = '#'
    for i in [0,2,4]:
        c = rgb[i:i+2]
        c = int(c, 16)
        c = int(c * rate)
        c = format(c, '02x')
        s += c
    return s

#Example of use
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
color_orig = [
color = [
    [darken(c) for c in color_orig],
df = pd.DataFrame([np.ones(10), np.ones(10)], columns=[x[1] + '\n' + x[0] for x in np.array(color).T])
df.T.plot.bar(color=color, stacked=True)


スクリーンショット 2021-01-06 午後2.59.40.png

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