Fetch and untile tiled Himawari-8 images from the http://himawari8.nict.go.jp PNG endpoint, then set them as desktop background on OSX

hi8-fetch.py

import requests
import sys
from datetime import datetime, timedelta
import pytz
from PIL import Image
from StringIO import StringIO
import os

# python himawari.py
# stolen from https://gist.github.com/celoyd/39c53f824daef7d363db

# Fetch Himawari-8 full disks at a given zoom level and set as desktop.
# Valid zoom levels seem to be powers of 2, 1..16, and 20.
#
# To do:
# - Better errors (e.g., catch the "No Image" image).
# - Librarify.


# Tile size for this dataset:
width = 550
height = 550


# time = parse(sys.argv[1])
tz = pytz.timezone('UTC')
time = datetime.now(tz) - timedelta(minutes=20)

scale = 8
out = '/path/to/script/desktop.png'


base = 'http://himawari8.nict.go.jp/img/D531106/%sd/550' % (scale)

tiles = [[None] * scale] * scale

def pathfor(t, x, y):
  return "%s/%s/%02d/%02d/%02d%02d00_%s_%s.png" \
  % (base, t.year, t.month, t.day, t.hour, (t.minute / 10) * 10, x, y)


sess = requests.Session() # so requests will reuse the connection
png = Image.new('RGB', (width*scale, height*scale))

for x in range(scale):
  for y in range(scale):

    try:
        path = pathfor(time, x, y)
        # print("fetching %s" % (path))
        tiledata = sess.get(path).content
        tile = Image.open(StringIO(tiledata))

        png.paste(tile, (width*x, height*y, width*(x+1), height*(y+1)))
    except requests.exceptions.ConnectionError as e:
        print(e)

png.save(out, 'PNG')

os.system("osascript -e 'tell application \"Finder\" to set desktop picture to \"" + out + "\" as POSIX file'")
# if you have multiple monitors and want to set all of the backgrounds, replace the above with this:
# os.system("osascript -e 'tell application \"System Events\" to set picture of every desktop to \"" + out + "\" as POSIX file'")

Hey, cool stuff! But it doesn't work for me.
When I uncomment line 50 I get output like:
fetching http://himawari8.nict.go.jp/img/D531106/8d/550/2016/02/05/105700_0_3.png
However, when i visit the URL with a browser, I get "The requested URL /img/D531106/8d/550/2016/02/05/105700_0_3.png was not found on this server."

Does this still work for you? Can you access the URL?

Ohh... silly me. I was running it with python3 and that's why (t.minute / 10) * 10 yielded 57 and not 50.
I couldn't get the image because they're only available for every ten minutes...