[Tutor] scratching my head - still

[Clayton Kirkwood]

As seen below (closely), some filenames are not being removed while others
are, such as in the first stanza, some pdfs are removed, some aren't. In the
second stanza, Thumbs.db makes it through, but was caught in the first
stanza. (Thanks for those who have proffered solutions to date!)
I see no logic in the results. What am I missing???
TIA, Clayton


import os
from os.path import join, getsize, splitext

main_dir = "/users/Clayton/Pictures"
directory_file_list = {}
duplicate_files = 0
top_directory_file_list = 0

for dir_path, directories, filenames in os.walk(main_dir):
    print( "filenames = ", filenames, "\n" )
    for filename in filenames:
        prefix, ext = splitext(filename)
        if not (ext and ext[1:].lower() in ('jpg', 'png', 'avi', 'mp4',
'mov', 'bmp') ):
            print( "deleting filename ", filename, "  because ",
ext[1:].lower(), " doesn't contain .jpg or .png or .avi or .mp4 or .bmp" )
            filenames.remove(filename)

    print("\nfilenames - bad exts:\n", filenames )


produces:

filenames =  ['.picasa.ini', '2010-11-02 15.58.30.jpg', '2010-11-02
15.58.45.jpg', '2010-11-25 09.42.59.jpg', '2011-03-19 19.32.09.jpg',
'2011-05-28 17.13.38.jpg', '2011-05-28 17.26.37.jpg', '2012-02-02
20.16.46.jpg', '218.JPG', 'desktop.ini', 'Guide ENG.pdf', 'Guide FRE.pdf',
'Guide GER.pdf', 'Guide Ita.pdf', 'Guide Spa.pdf', 'honda accident 001.jpg',
'honda accident 002.jpg', 'honda accident 003.jpg', 'honda accident
004.jpg', 'honda accident 005.jpg', 'honda accident 006.jpg', 'honda
accident 007.jpg', 'Image (1).jpg', 'Image.jpg', 'IMG.jpg', 'IMG00003.jpg',
'IMG00040.jpg', 'IMG00058.jpg', 'IMG_0003.jpg', 'IMG_0004.jpg',
'IMG_0005.jpg', 'IMG_0007.jpg', 'IMG_0008.jpg', 'IMG_0009.jpg',
'IMG_0010.jpg', 'Mak diploma handshake.jpg', 'New Picture.bmp', 'OneNote
Table Of Contents (2).onetoc2', 'temp 121.jpg', 'temp 122.jpg', 'temp
220.jpg', 'temp 320.jpg', 'temp 321.jpg', 'temp 322.jpg', 'temp 323.jpg',
'temp 324.jpg', 'temp 325.jpg', 'temp 326.jpg', 'temp 327.jpg', 'temp
328.jpg', 'temp 329.jpg', 'temp 330.jpg', 'temp 331.jpg', 'temp 332.jpg',
'temp 333.jpg', 'temp 334.jpg', 'temp 335.jpg', 'temp 336.jpg', 'temp
337.jpg', 'temp 338.jpg', 'temp 339.jpg', 'temp 340.jpg', 'temp 341.jpg',
'temp 342.jpg', 'temp 343.jpg', 'Thumbs.db'] 

deleting filename  .picasa.ini   because  ini  doesn't contain .jpg or .png
or .avi or .mp4 or .bmp
deleting filename  desktop.ini   because  ini  doesn't contain .jpg or .png
or .avi or .mp4 or .bmp
deleting filename  Guide FRE.pdf   because  pdf  doesn't contain .jpg or
.png or .avi or .mp4 or .bmp
deleting filename  Guide Ita.pdf   because  pdf  doesn't contain .jpg or
.png or .avi or .mp4 or .bmp
deleting filename  OneNote Table Of Contents (2).onetoc2   because  onetoc2
doesn't contain .jpg or .png or .avi or .mp4 or .bmp
deleting filename  Thumbs.db   because  db  doesn't contain .jpg or .png or
.avi or .mp4 or .bmp

filenames - bad exts:
 ['2010-11-02 15.58.30.jpg', '2010-11-02 15.58.45.jpg', '2010-11-25
09.42.59.jpg', '2011-03-19 19.32.09.jpg', '2011-05-28 17.13.38.jpg',
'2011-05-28 17.26.37.jpg', '2012-02-02 20.16.46.jpg', '218.JPG', 'Guide
ENG.pdf', 'Guide GER.pdf', 'Guide Spa.pdf', 'honda accident 001.jpg', 'honda
accident 002.jpg', 'honda accident 003.jpg', 'honda accident 004.jpg',
'honda accident 005.jpg', 'honda accident 006.jpg', 'honda accident
007.jpg', 'Image (1).jpg', 'Image.jpg', 'IMG.jpg', 'IMG00003.jpg',
'IMG00040.jpg', 'IMG00058.jpg', 'IMG_0003.jpg', 'IMG_0004.jpg',
'IMG_0005.jpg', 'IMG_0007.jpg', 'IMG_0008.jpg', 'IMG_0009.jpg',
'IMG_0010.jpg', 'Mak diploma handshake.jpg', 'New Picture.bmp', 'temp
121.jpg', 'temp 122.jpg', 'temp 220.jpg', 'temp 320.jpg', 'temp 321.jpg',
'temp 322.jpg', 'temp 323.jpg', 'temp 324.jpg', 'temp 325.jpg', 'temp
326.jpg', 'temp 327.jpg', 'temp 328.jpg', 'temp 329.jpg', 'temp 330.jpg',
'temp 331.jpg', 'temp 332.jpg', 'temp 333.jpg', 'temp 334.jpg', 'temp
335.jpg', 'temp 336.jpg', 'temp 337.jpg', 'temp 338.jpg', 'temp 339.jpg',
'temp 340.jpg', 'temp 341.jpg', 'temp 342.jpg', 'temp 343.jpg'] 

filenames =  ['IMG_0028.JPG', 'IMG_0031.JPG', 'IMG_0032.JPG',
'IMG_0035.JPG', 'IMG_0037.JPG', 'IMG_0039.JPG', 'OneNote Table Of
Contents.onetoc2', 'Thumbs.db', 'ZbThumbnail.info'] 

deleting filename  OneNote Table Of Contents.onetoc2   because  onetoc2
doesn't contain .jpg or .png or .avi or .mp4 or .bmp
deleting filename  ZbThumbnail.info   because  info  doesn't contain .jpg or
.png or .avi or .mp4 or .bmp

filenames - bad exts:
 ['IMG_0028.JPG', 'IMG_0031.JPG', 'IMG_0032.JPG', 'IMG_0035.JPG',
'IMG_0037.JPG', 'IMG_0039.JPG', 'Thumbs.db']