Question

I have written the following code to save an album from a website.

import urllib2
import webbrowser
import os
page=1564848
fileno=1
for fileno in range(1,24):
    pages=str(page)
    filenos=str(fileno)
    picture_page = "url-to-the-website"+pages+".jpg"
    page=page+1
    os.chdir("/home/comrider/Album/")
    if not os.path.exists("3"):
        os.makedirs("3")
    os.chdir("/home/user/Album/3")
    try:
        opener1 = urllib2.build_opener()
        page1 = opener1.open(picture_page)
        my_picture = page1.read()
        filename = filenos + picture_page[-4:]
        fileno=fileno+1
        fout = open(filename, "wb")
        fout.write(my_picture)
        fout.close()
    except:
        fileno=fileno-1 #This statement is not working
        pass

Since there are missing image number i have given a try and except statement and in the except statement I have given a statement to decrement the file no. that was incremented in the try statements. But that code is not working resulting in incomplete downloading of the album. The working platform is linux. Please help. thanks in advance.

Answer 1

fileno will be reset on the next loop iteration, you can change it to whatever you want but when the current for loop iteration ends it will increment from 1..24

from the docs:

Python’s for statement iterates over the items of any sequence (a list
or a string), in the order that they appear in the sequence

range returns a list sequence you are progressing along that sequence

if you need to mess with your counter you could use a while loop

fileno = 1    
while fileno < 24:
  #  do stuff
  # just remember to increment at the end, you control when the loop returns
  fileno += 1