On Mar 16, 7:09 am, Laurent Rahuel <[EMAIL PROTECTED]> wrote: > Maybe the walk method in os module is what you > needhttp://docs.python.org/lib/os-file-dir.html > > Regards > > Jon Clements wrote: > > On 16 Mar, 09:02, "Jon Clements" <[EMAIL PROTECTED]> wrote: > >> On 16 Mar, 03:56, "hiro" <[EMAIL PROTECTED]> wrote: > > >> > Hi there, > > >> > I'm very new to python, the problem I need to solve is whats the "best/ > >> > simplest/cleanest" way to read in multiple files (ascii), do stuff to > >> > them, and write them out(ascii). > > >> > -- > >> > import os > > >> > filePath = ('O:/spam/eggs/') > >> > for file in os.listdir(filePath): #straight from docs > >> > # iterate the function through all the files in the directory > >> > # write results to separate files <- this is where I'm mostly > >> > stuck. > > >> > -- > >> > For clarity's sake, the file naming conventions for the files I'm > >> > reading from are file.1.txt -> file.nth.txt > > >> > It's been a long day, i'm at my wits end, so I apologize in advance if > >> > I'm not making much sense here. > >> > syntax would also be great if you can share some recipes. > > >> I'd try the glob module. > > >> [code] > >> import glob > > >> # Get a list of filenames matching wildcard criteria > >> # (note that path is relative to working directory of program) > >> matching_file_list = glob.glob('O:/spam/eggs/*.txt') > > >> # For each file that matches, open it and process it in some way... > >> for filename in matching_file_list: > >> infile = file(filename) > >> outfile = file(filename + '.out','w') > >> # Process the input file line by line... > >> for line in infile: > >> pass # Do something more useful here, change line and write to > >> outfile? > >> # Be explicit with file closures > >> outfile.close() > >> infile.close() > >> [/code] > > >> Of course, you can change the wild card criteria in the glob > >> statement, and also then filter further using regular expressions to > >> choose only files matching more specific criteria. This should be > >> enough to get you started though. > > >> hth > > >> Jon.- Hide quoted text - > > >> - Show quoted text - > > > Okies; postcoding before finishing your early morning coffee is not > > the greatest of ideas! > > > I forgot to mention that glob will return pathnames as well. You'll > > need to check that os.path.isfile(filename) returns True before > > processing it... > > > Jon.
Also, leaving the format as .out is not necessarily convenient. You had glob do a search for .txt, so how about doing: Also, Python advises using open() over file() (although I admit to using file() myself more often than not) >>for filename in matching_file_list: >> infile = open(filename,'r') # add 'r' for clarity if nothing else >> outfile = open(filename[:-4] + '.out.txt','w') # assumes file ext of >> original file is .txt >> # Process the input file line by line... >> for line in infile: >> pass # do thing --> you don't have to iterate line by line, if you >> specified what you wanted to do to each file we could probably help out here >> if you need it. >> # Be explicit with file closures >> outfile.close() >> infile.close() Might also add some try/except statements to be safe ;). Cheers, Jordan -- http://mail.python.org/mailman/listinfo/python-list
