file-size-documentation.py

import os
import math
import csv

def humanizeFileSize(filesize):
    filesize = abs(filesize)
    if (filesize==0):
        return "0 Bytes"
    p = int(math.floor(math.log(filesize, 2)/10))
    return "%0.2f %s" % (filesize/math.pow(1024,p), ['Bytes','KB','MB','GB','TB','PB','EB','ZB','YB'][p])

def csv_writer(data, path):
    with open(path, "wb") as csv_file:
        writer = csv.writer(csv_file, delimiter=',')
        writer.writerow(['Name', 'Size', 'Label'])
        for line in data:
            writer.writerow(line)

targetDirectory = '/your/directory/name'
output = []
path = targetDirectory.split('/')[-1] + '-size-report.csv'

for root, dirs, files in os.walk(targetDirectory, topdown=False):
    for name in files:
        if (name not in ['.DS_Store']):
            
            filePath = os.path.join(root, name)
            fileSize = os.path.getsize(filePath)

            size = humanizeFileSize(fileSize).split(' ')[0]
            label = humanizeFileSize(fileSize).split(' ')[1]

            output.append([name, size, label])

csv_writer(output, path)

print "File Successfully Written!"