avg_pixel.py

from PIL import Image
import numpy as np
img = Image.open('img.jpg', "r")

pixels = np.asarray(img)

add = [0,0,0]
index = 0

for row in pixels:
	for pixel in row:
		add += pixel
		index += 1

result = add/index

result_list = []
for x in result:
	result_list.append(int(round(x)))


print ('#%02x%02x%02x' % tuple(result_list))