Himawari 8 - Earth photos downloading

earth.py

'''
    Himawari 8 - Earth
    
    Usage: python earth.py 2 10
        First argument: quality of photo
        Second argument: count of downloaded photos (default 1)
'''

from datetime import datetime, timedelta
from math import sqrt
from PIL import Image
import urllib2
from sys import argv
import hashlib
import io

try :
    rank = int(argv[1]) # can be 2, 4, 8, 16, 20
except:
    print 'Takes 0 arguments (1 expected)'
    exit (1)

try :
    count = int(argv[2]) # count of photos
except:
    count = 1 # default: one photo


width = 550
size = int(rank**2)


base = 'http://himawari8-dl.nict.go.jp/himawari8/img/D531106/'

year, month, day, hour, minute = datetime.strftime(datetime.now(), '%Y %m %d %H %M').split(' ')

prefix = '{0}{1}d/{2}/{3}/{4}'.format(base, str(rank), str(width), year, month)


day = int(day)
hour = int(hour)
minute = int(minute[0])

while day >= 0 and count:
    str_day = '0' + str(day) if day <= 9 else str(day)
    str_hour = '0' + str(hour) if hour <= 9 else str(hour)
    str_minute = str(minute) + '0'


	
    url = '{0}/{1}/{2}{3}00'.format(prefix, str_day, str_hour, str_minute) + '_{0}_{1}.png'
    print 'Search by date: {0}/{1}/{2} {3}:{4}:00'.format(year, month, str_day, str_hour, str_minute)
    try: 
        h1 = hashlib.md5(urllib2.urlopen(url.format('0', '0')).read()).hexdigest()
        h2 = hashlib.md5(urllib2.urlopen(url.format(str(rank/2), str(rank/2))).read()).hexdigest()
        if h1 == h2:
            raise urllib2.HTTPError("Error")
		
        image = Image.new("RGB", (width * rank, width * rank))
        print 'Found pictures'

        current_percent = -1
        for index in xrange(size):
            percent = int((index + 1) * (100.0 / size))
            if percent != current_percent:
                current_percent = percent
                print 'Concate pictures: {0}%'.format(str(current_percent))
            row = index / rank
            column = index % rank

            path = io.BytesIO(urllib2.urlopen(url.format(str(row), str(column))).read())
            image.paste(Image.open(path), (row * width, column * width))

        photo_name = 'earth_{0}.{1}.{2}_{3}:{4}:{5}.png'.format(str_day, month, year, str_hour, str_minute, '00')
        image.save(photo_name)
        print 'Saved: {0}'.format(photo_name)
        count = count - 1		
    except KeyboardInterrupt:
        print '\nSearching was terminated'
        exit(1)
    except:
        pass

    if minute == 0:
        minute = 5
        hour = hour - 1
    else:
        minute = minute - 1

    if minute == 0 and hour == 0:
        minute = 5
        hour = 23
        day = day - 1
	
    if minute == 0 and hour == 0 and day == 0:
        print 'Url not found'
        exit(1)