This script creates a number of directories based on POSCARS-* generated from phonopy code

Generate Phonon directories for VASP

#!/usr/bin/env python3.6
#_____________________________________________________________________________
'''
USAGE: 	python3 script to create directories for POSCAR files generated from
		    PHONOPY code.

Credit: Asif Iqbal Bhatti
DATED:	19-01-2020

'''
#_____________________________________________________________________________
import 	os, sys, scipy
import  pathlib, subprocess, shutil
from 	os import listdir
from 	os.path import isfile, join
import 	os.path
import 	multiprocessing as mp
import 	fnmatch
import 	time

#_____________________________________________________________________________

#os.system("phonopy -d --dim="2 2 2") ## It will call a phonopy code
os.system('rm -r disp-*')
#_____________________________________________________________________________


def copy_fntn(k):
	for i in range(1, int(k)+1):
		shutil.rmtree('disp-'+str(i).zfill(3), ignore_errors=True) #overwrite a directory
		os.mkdir('disp-'+str(i).zfill(3))
		#subprocess.check_call(['mkdir', 'disp-'+str(i).zfill(3)])
		#subprocess.check_call('cd disp-'+str(i).zfill(3), shell=True)	
		# print(str(i).zfill(3))
		#
		# The zfill()/rjust() is a function associated with the string object. 
		# 3 is the expected length of the string after padding.
		#
		os.system('cp INCAR   disp-'+str(i).zfill(3) )
		os.system('cp POTCAR  disp-'+str(i).zfill(3) )
		os.system('cp KPOINTS disp-'+str(i).zfill(3) )
		os.system('cp job.sh  disp-'+str(i).zfill(3) )
		subprocess.call(['cp','-r','POSCAR-'+str(i).zfill(3),'disp-'+str(i).zfill(3)], shell = False)
		os.chdir('disp-'+str(i).zfill(3))
		shutil.copyfile("POSCAR-"+str(i).zfill(3), "POSCAR-"+str(i).zfill(3)+"-disp")
		#os.system('ls')
		os.chdir('../')


if __name__ == '__main__':
	print("Number of processors Detected: ", mp.cpu_count())
	pool = mp.Pool(4)
	print("*"*80)
	if not os.path.exists('POSCAR'):
		print (' ERROR: POSCAR does not exist here.')
		sys.exit(0)
	else:
		counter=0
		mypath = os.getcwd()	
		for entry in os.listdir(mypath):
			if os.path.isfile(os.path.join(mypath, entry)):
				if fnmatch.fnmatchcase(entry,'POSCAR-*'):
					counter+=1
		print ("# of POSCAR-* files generated with Phonopy code: ----> {}".format(counter) )
		print("*"*80)	

		start_time = time.time()
		#copy_fntn(counter)
		#p = mp.Process(target=copy_fntn, args=('9',))
		#p.start()
		#p.join()
		with pool as p:
			p.map(copy_fntn, [counter])
	end_time = time.time()
	print("total time taken this loop: ", end_time - start_time)

Please check for your self. I have tried to implement the multiprocessing on the most demanding for loop part but I guess the speed is same.