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Python: Iterate over a root level path and print all its sub-directories and files

Python Operating System Services: Exercise-11 with Solution

Write a Python program to iterate over a root level path and print all its sub-directories and files, also loop over specified dirs and files.

Sample Solution:

Python Code :

import os
print('Iterate over a root level path:')
path = '/tmp/'
for root, dirs, files in os.walk(path):
 print(root)

Sample Output:

Iterate over a root level path:
/tmp/

Python Code :

import os
print('Loop over dirs and files:')
path = '/tmp/'
for root, dirs, files in os.walk(path):
       print(root)
       for _dir in dirs:
           print(_dir)
       for _file in files:
           print(_file)

Output:

Loop over dirs and files:
/tmp/
0001.png
0002.png
0003.png
0004.png
0005.png
0006.png
0007.png
0008.png
0009.png
0010.png
.....
0037.png
0038.png
0039.png
0040.png
0041.png
0042.png
0043.png
0044.png
123.npy
123.npz

Python Code Editor:

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m