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Runtime error
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#!/usr/bin/env python3
"""Assembles images into a grid."""
import argparse
import math
import sys
from PIL import Image
def main():
p = argparse.ArgumentParser(description=__doc__)
p.add_argument('images', type=str, nargs='+', metavar='image',
help='the input images')
p.add_argument('--output', '-o', type=str, default='out.png',
help='the output image')
p.add_argument('--nrow', type=int,
help='the number of images per row')
args = p.parse_args()
images = [Image.open(image) for image in args.images]
mode = images[0].mode
size = images[0].size
for image, name in zip(images, args.images):
if image.mode != mode:
print(f'Error: Image {name} had mode {image.mode}, expected {mode}', file=sys.stderr)
sys.exit(1)
if image.size != size:
print(f'Error: Image {name} had size {image.size}, expected {size}', file=sys.stderr)
sys.exit(1)
n = len(images)
x = args.nrow if args.nrow else math.ceil(n**0.5)
y = math.ceil(n / x)
output = Image.new(mode, (size[0] * x, size[1] * y))
for i, image in enumerate(images):
cur_x, cur_y = i % x, i // x
output.paste(image, (size[0] * cur_x, size[1] * cur_y))
output.save(args.output)
if __name__ == '__main__':
main()
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