npcat

#!/usr/bin/python
# Cat a np array from a .npy file
import numpy as np
from PIL import Image
import sys

def die(msg):
  msg += "\n" if msg[-1]!="\n" else ""
  sys.stderr.write(msg)

argp = 1
DoUni = False
DoBlock = True
while argp < len(sys.argv) and sys.argv[argp][0]=='-':
  S_ = sys.argv[argp]
  argp+= 1

  if S_=='-help':
    print('pretty print a np array in a terminal\n'
          '\n'
          'Syntax:\n'
          '  npcat [--uni] arr\n'
          'Options:\n'
          '  --uni  Use unicode block characters'          
          )
    exit(0)
  if S_=='--uni':
    DoUni= True
    continue
  if S_=='--circle':
    DoUni = True
    DoBlock= False
    continue
  die('Unknown option ' + S_)

if argp >= len(sys.argv):
  die("Need name of bitmap!")
Filename = sys.argv[argp]
argp+= 1

if Filename.endswith('.png'):
  im = np.array(Image.open(Filename))
  if im.dtype == np.bool:
    im = im.astype(np.uint8)
elif Filename.endswith('.npy'):
  im = np.load(Filename)
else:
  die('Unsupported extension!')
if DoUni or DoCompact:
  if im.min() < 0 or im.max() > 1:
    die('Can only do unicode or compact printing on binary images')
  Chars = '█ ' if DoBlock else '⬤◯'
  for row in im.tolist():
    print(''.join(Chars[v] for v in row))
else:
  print(im)