folder_size.py

# Script Name   : folder_size.py
# Author        : Craig Richards
# Created       : 19th July 2012
# Last Modified	: 22 February 2016
# Version       : 1.0.1

# Modifications : Modified the Printing method and added a few comments

# Description   : This will scan the current directory and all subdirectories and display the size.

import os       # Load the library module
directory = '.' # Set the variable directory to be the current directory
dir_size = 0    # Set the size to 0

fsizedicr = {'Bytes': 1, 'Kilobytes': float(1)/1024, 'Megabytes': float(1)/(1024*1024), 'Gigabytes': float(1)/(1024*1024
                                                                                                               *
                                                                                                               1024)}
                                                                                                               
for (path, dirs, files) in os.walk(directory):      # Walk through all the directories. For each iteration, os.walk returns the folders, subfolders and files in the dir.
    for file in files:                              # Get all the files
        filename = os.path.join(path, file)         
        dir_size += os.path.getsize(filename)       # Add the size of each file in the root dir to get the total size.
        
fsizeList = [str(round(fsizedicr[key]*dir_size, 2)) + " " + key for key in fsizedicr] # List of units 

if dir_size == 0: print ("File Empty") # Sanity check to eliminate corner-case of empty file. 
else:
  for units in sorted(fsizeList)[::-1]: # Reverse sort list of units so smallest magnitude units print first.
      print ("Folder Size: " + units)