检查文件是Python 2.7.11中的目录还是常规文件

Question

I have written this code for checking if some of the files in a particular directory are further files or directories.

My file structure is like like:

C:\Users\Desktop\pythonprograms
|-temp1
|-temp2
|-sample.py

import os

filepath = os.getcwd()
backslash = "\\"
allfiles = os.listdir(filepath)

for indexval in range(filelist):
   print "File  ", indexval, allfiles[indexval], type(allfiles[indexval])   
checkfileisdir = filepath + backslash
dirsavailable = [checkfileisdir + indexval for indexval in allfiles]
for checkfile in dirsavailable:
    print os.path.isdir(checkfileisdir)

The above code returns True for the directories as well as the files.

Further, the following code does the trick of solving the problem. I am looking for explanations rather than code snippets.

for indexval in range(filelist):
   print "File  ", indexval, allfiles[indexval], type(allfiles[indexval])           
   checkfileisdir = filepath + backslash + allfiles[indexval]
   print os.path.isdir(checkfileisdir),

I am not able to explain why. Can someone help me learn?

Thanks in advance.

Answer 1

You are trying to use incorrect function for your task.

Read in documentation

os.listdir

Return a list containing the names of the entries in the directory given by path. The list is in arbitrary order. It does not include the special entries '.' and '..' even if they are present in the directory.

entries in the directory here is any kind of entry (file, directory, etc)

You need to use this function:

os.walk(top, topdown=True, onerror=None, followlinks=False)

Generate the file names in a directory tree by walking the tree either top-down or bottom-up. For each directory in the tree rooted at directory top (including top itself), it yields a 3-tuple (dirpath, dirnames, filenames).

Here is a good usage example