Pretty print matrix with colors proportional to each value.

ppmatrix.py

import numpy as np
# https://stackoverflow.com/questions/4842424/list-of-ansi-color-escape-sequences
A = np.random.randint(-100, 100, size=(7, 7))
def pformat(A, header=True):
    mv = min([min([int(v) for v in row]) for row in A])
    Mv = max([max([int(v) for v in row]) for row in A]) 
    f = lambda r, m, M: int(- (255*r)/(m - M) + (255*m)/(m-M))
    #c = '\033[38;2;{1};{2};{3};48;2;0;0;0m{0}\033[0m'.format 
    c = '\033[38;2;{1};{2};{3}m{0}\033[0m'.format 
    middle = (Mv - mv)/2 + mv                                                                                         
    pv = lambda t, v: c(t, 0, f(v, mv, middle), 255) if v <= middle else c(t, 0, 255, 255 - f(v, middle, Mv))
    m, text = max([max([len(str(v)) for v in row]) for row in A]), ''
    if header:
        H = ' '*m + pv(mv, mv)
        H += ''.join([pv('=', v) for v in np.linspace(mv, Mv, num=len(A)*(m+2))])
        H += pv(Mv, Mv) + '  \n\n\n'
        text = H
    for l in A:                            
        text += ' '*m
        for v in l:  
            text += ' '*(m-len(str(v))) + pv(v, int(v)) + ' '*3
        text += '\n'
    return text

print(pformat(A))