Do I need to pass the full path of a file in another directory to open

Question

I have a folder with ten files in it which I want to loop through  When I print out the name of the file my code works fine   import os indir     home des test  for root  dirs  filenames in os walk indir       for f in filenames          print f    Which prints   1 2 3 4 5 6 7 8 9 10   But if I try to open the file in the loop I get an IO error   import os indir     home des test  for root  dirs  filenames in os walk indir       for f in filenames          log   open f   r    Traceback  most recent call last   File   home des my python progs loop over dir py   line 6  in  lt module gt  log   open f   r   IOError   Errno 2  No such file or directory   1   gt  gt  gt     Do I need to pass the full path of the file even inside the loop to open   them

User · Answer

You have to specify the path that you are working on   source     home test py test   for root  dirs  filenames in os walk source       for f in filenames          print f         fullpath   os path join source  f          log   open fullpath   r

User · Answer

Here s a snippet that will walk the file tree for you   indir     home des test  for root  dirs  filenames in os walk indir       for f in filenames          print f          log   open indir   f   r

User · Answer

If you are just looking for the files in a single directory  ie you are not trying to traverse a directory tree  which it doesn t look like   why not simply use os listdir     import os   for fn in os listdir            if os path isfile fn           print  fn    in place of os walk    You can specify a directory path as a parameter for os listdir    os path isfile   will determine if the given filename is for a file

User · Answer

The examples to os walk in the documentation show how to do this   for root  dirs  filenames in os walk indir       for f in filenames          log   open os path join root  f   r     How did you expect the  open  function to know that the string  1  is supposed to mean   home des test 1   unless   home des test  happens to be your current working directory

User · Answer

Yes  you need the full path     log   open os path join root  f    r     Is the quick fix   As the comment pointed out  os walk decends into subdirs so you do need to use the current directory root rather than indir as the base for the path join

[python] Do I need to pass the full path of a file in another directory to open()?

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