> -----Original Message----- > From: Tutor [mailto:tutor-bounces+crk=godblessthe...@python.org] On > Behalf Of Steven D'Aprano > Sent: Sunday, August 02, 2015 5:49 PM > To: tutor@python.org > Subject: Re: [Tutor] scratching my head > > On Sun, Aug 02, 2015 at 02:44:15PM -0700, Clayton Kirkwood wrote: > > > for dir_path, directories, files in os.walk(main_dir): > > for file in files: > > # print( " file = ", file) > > # if( ("(\.jpg|\.png|\.avi|\.mp4)$") not in file.lower() ): > > # if( (".jpg" or ".png" or ".avi" or ".mp4" ) not in file.lower() > > name, ext = os.path.splitext(filename) > if ext.lower() in ('.jpg', '.png', '.avi', '.mp4'): > ... > > > > # del files[file] > > # > > #I get an error on int expected here. If I'm able to access by string, > > why wouldn't I be able to #acess in the del? > > What are you attempting to do here? files is a list of file names: > > files = ['this.jpg', 'that.txt', 'other.pdf'] filename = 'that.txt' > > What do you expect files['that.txt'] to do? > > The problem has nothing to do with del, the problem is that you are trying to > access the 'that.txt'-th item of a list, and that is meaningless.
Well, I was expecting that the list entry would be deleted. In other parts of my code I am using filenames as the index of lists: list[filenames] for for loops and some ifs where it appears to work. I am able to look at directories and the files in them by doing this. Check the rest of my original code. I had one if that complained at the bottom of my code that complained that the index was supposed to be an in not the list element value. So I get that the index is supposed to be an int, and I think what is happening in much of the code is the filename somehow becomes an int and then the list accesses that way. It's very confusing. Basically, I was using filenames as indexes into the list. > > > > print( "looking at file ", file, " in > > top_directory_file_list ", top_directory_file_list ) > > What does this print? In particular, what does the last part, > top_directory_file_list, print? Because the next error: > > > if file in top_directory_file_list: > > #error: arg of type int not iterable > > is clear that it is an int. > > > #yet it works for the for loops > > I think you are confusing: > > top_directory_file_list > > directory_file_list I don't know. If you look at the code that is going thru the directory filename by filename the prints kick out filename and directories and the list elements are addressed by "strings", the actual filenames. What is happening in most of the code looks like what one would expect if the lists could be indexed by words not ints. As a programmer, I would expect lists to be addressed via a name or a number. It seems kind of like dicktionaries. Am I mixing dictionaries and list? Clayton > > > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
