Generating a Random Hex Color in Python

Question

For a Django App, each \"member\" is assigned a color to help identify them. Their color is stored in the database and then printed/copied into the HTML when it is needed. T

Answer 1

little late to the party,

import random
chars = '0123456789ABCDEF'
['#'+''.join(sample(chars,6)) for i in range(N)]

Answer 2

So many ways to do this, so here's a demo using "colorutils".

pip install colorutils

It is possible to generate random values in (RGB, HEX, WEB, YIQ, HSV).

# docs and downloads at 
# https://pypi.python.org/pypi/colorutils/

from colorutils import random_web
from tkinter import Tk, Button

mgui = Tk()
mgui.geometry('150x28+400+200')


def rcolor():
    rn = random_web()
    print(rn)  # for terminal watchers
    cbutton.config(text=rn)
    mgui.config(bg=rn)


cbutton = Button(text="Click", command=rcolor)
cbutton.pack()

mgui.mainloop()

I certainly hope that was helpful.

Answer 3

Basically, this will give you a hashtag, a randint that gets converted to hex, and a padding of zeroes.

from random import randint
color = '#{:06x}'.format(randint(0, 256**3))
#Use the colors wherever you need!

Answer 4

Would like to improve upon this solution as I found that it could generate color codes that have less than 6 characters. I also wanted to generate a function that would create a list that can be used else where such as for clustering in matplotlib.

import random

def get_random_hex:
    random_number = random.randint(0,16777215)

    # convert to hexadecimal
    hex_number = str(hex(random_number))

    # remove 0x and prepend '#'
    return'#'+ hex_number[2:]

My proposal is :

import numpy as np 

def color_generator (no_colors):
    colors = []
    while len(colors) < no_colors:
        random_number = np.random.randint(0,16777215)
        hex_number = format(random_number, 'x')
        if len(hex_number) == 6: 
            hex_number = '#'+ hex_number
            colors.append (hex_number)
    return colors

Answer 5

For generating random anything, take a look at the random module

I would suggest you use the module to generate a random integer, take it's modulo 2**24, and treat the top 8 bits as R, that middle 8 bits as G and the bottom 8 as B.
It can all be accomplished with div/mod or bitwise operations.

Answer 6

Store it as a HTML color value:

Updated: now accepts both integer (0-255) and float (0.0-1.0) arguments. These will be clamped to their allowed range.

def htmlcolor(r, g, b):
    def _chkarg(a):
        if isinstance(a, int): # clamp to range 0--255
            if a < 0:
                a = 0
            elif a > 255:
                a = 255
        elif isinstance(a, float): # clamp to range 0.0--1.0 and convert to integer 0--255
            if a < 0.0:
                a = 0
            elif a > 1.0:
                a = 255
            else:
                a = int(round(a*255))
        else:
            raise ValueError('Arguments must be integers or floats.')
        return a
    r = _chkarg(r)
    g = _chkarg(g)
    b = _chkarg(b)
    return '#{:02x}{:02x}{:02x}'.format(r,g,b)

Result:

In [14]: htmlcolor(250,0,0)
Out[14]: '#fa0000'

In [15]: htmlcolor(127,14,54)
Out[15]: '#7f0e36'

In [16]: htmlcolor(0.1, 1.0, 0.9)
Out[16]: '#19ffe5'