Page 2 - My first Python program!

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#16

January 29th, 2012, 03:33 PM

ViralFrost

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Ya, I've always been bad with adding comments to my code lol...I don't usually need it myself unless the program is really complex, so it's usually an after thought.

#17

January 29th, 2012, 03:38 PM

SuperOscar

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Quote:

Originally Posted by ViralFrost

I don't understand what you're doing with fmt ( '{0}' or '{0:02d}') please explain

Doing (new-style) string formatting. The following:

Code:

num = 2
print('{0}'.format(num))

prints just “2”. “{0}” is the placeholder for the argument of the format() method.

The following:

Code:

print('{0:02d}'.format(num))

would print “02”; the formatting string “02d” means a 2-digit number padded with zeroes.

Note: you can use the format() method anywhere, not only in a print statement (or print call, as in my examples).

#18

January 29th, 2012, 04:14 PM

ViralFrost

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I think one of my mistakes was thinking that in 'for x in a', x was in iterator, but I just realized that it's the data in a[...]... is that correct?

#19

January 29th, 2012, 04:16 PM

ViralFrost

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I've got a lot to learn about Python clearly, but I really appreciate all the help, thank you all very much!

#20

January 29th, 2012, 05:10 PM

ViralFrost

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Updated Code

Once again, here's the updated code with a couple of changes. Putting in a beginning image number actually works now, added comments, there can be infinite number of leading 0s with no limit on number of files to be downloaded **EDIT** - there is still a problem where you can only download files under 100...any ideas how to fix this? - **EDIT**
**EDIT** - code updated, no problem with leading 0s or limit on file numbers or amount of files - **EDIT**, also changed code to reflect the ability to download any type of sequenced file.

Quote:

Example:
Save directory: C:\Downloads\
URL of file folder on server: http://blob.perl.org/books/beginning-perl/
File prefix: 3145_Chap
Starting file number: 1
Ending file number: 14
Leading 0s: 1
File extension: pdf

Code:

import urllib
import os
import random

#get input - local save directory
savdir = raw_input('\nEnter the directory to save to: ')

#if local save folder doesn't exist, create it - change directory to local save directory
if not os.path.exists(savdir):
	os.mkdir(savdir)
os.chdir(savdir)

#get input - URL, file prefix, first file number, last file number, number of leading 0s, file extension
file_folder = raw_input('Enter URL of containing folder: ')
fprefix = raw_input('Enter file prefix: ')
ffnum = raw_input('Enter starting file number: ')
flnum = raw_input('Enter ending file number: ')
num0 = raw_input('Number of leading 0s (on ones column ex: 001 would be 2 0s, 01 would be 1 0): ')
ext = raw_input('Enter file extension: ')

#create list of file numbers - add leading 0s
fmt = '{0}'
fmt = '{0:0' + str(int(num0)+1) + 'd}'
a = [fmt.format(x) for x in range(int(ffnum), int(flnum) + 1)]

#create random folder in local save directory to save files to
rfolder = str(int(random.random()*7384))
os.mkdir(rfolder)

#output file source and file destination - download files from URL and save to local save folder - output number of files downloaded / number of files
print('\n----Beginning download of ' + str(int(flnum) - int(ffnum) + 1) + ' files----\n')
for x in a:
		print('Src: ' + file_folder + fprefix + str(a[int(x) - int(ffnum)]) + '.' + ext)
		print('Dst: ' + os.getcwd() + '\\' + rfolder + '\\' + fprefix + str(a[int(x) - int(ffnum)]) + '.' + ext)
		urllib.urlretrieve(file_folder + fprefix + str(a[int(x) - 1 - int(ffnum)]) + '.' + ext, os.getcwd() + '\\' + rfolder + '\\' + fprefix + str(a[int(x) - int(ffnum)]) + '.' + ext)
		print('----Download ' + str(int(x) + 1 - int(ffnum)) + '/' + str(int(flnum) - int(ffnum) + 1) + ' complete----\n')