Copy all the files from subdirectories to another directory without the folder hierarchy.

copy.py

import os, sys
from shutil import copy
import progressbar

read_des = "./"
write_des = "../final/"

count = 0 
max_count = 0

for root, dirs, files in os.walk(read_des):
    max_count += len(files)

max_count-=1
bar = progressbar.ProgressBar(maxval=max_count, widgets=[progressbar.Bar('=', 'Working: [', ']'), ' ', progressbar.Percentage()])
bar.start()


try:
	os.mkdir(write_des)
except:
	print("Write_des already exists.")

for folder in os.listdir(read_des):
	if not os.path.isdir(folder):
		continue
	path = folder + '/'
	try:
		for file in os.listdir(path):
			file_path = path + file
			copy(file_path, write_des)
			count+=1
			bar.update(count)
	except Exception as e:
		raise e
print("DONE...")
print(str(count) + " out of " + str(max_count) +  " files processed")