[Pydev-users] Python program running twice

[Gary R. <gar...@ve...>]

I've had several occasions when a python program seems to loop through 
twice. Below is an example:

from os import walk
import subprocess

f = []
x = ""
for (dirpath, dirnames, filenames) in walk('.'):
     f.extend(filenames)
     f.sort()

for x in f:
     if x[-3:]=='JPG':
         print(x)
         args = "convert " + x + " -rotate " + "-90 " + x
         subprocess.call(args, shell=True)

This program should rotate a jpg file by 90 degrees left. It actually 
rotates the file 180 degrees and the print(x) function prints the file 
name twice. What am I doming wrong.

I run it as python rotate.py from the command line.

Gary R.