title: error copying folder with python
body: <p>i made a program that copy automatically a usb device.
  when it copy the usb it create one folder in correct destination, and one folder in the same path of python program. i want that itcreate only one folder in correct destination! thanks</p>
  
  <p>this is the code:</p>
  
  <pre><code>import shutil
  from array import *
  import math
  import time
  import os
  import sys
  import random
  import datetime
  
  
  def data():
       now = datetime.datetime.now()
       format = "%d %b %H.%M"
       global now_date
       now_date = now.strftime(format)
       format = "%M"
       global minuti
       minuti = now.strftime(format)
  
  data()
  old_date = now_date
  
  alfabeto = ['A:','B:','F:','G:','H:','I:','L:','M:','N:','O:',] #mancano e,c,d
  
  a = (r'')
  b=random.choice('abcdefghilmnopqrstuvz1234567890èòàù')
  new_dir = '{}'.format(now_date) 
  inc = (r'C:\documenti\program\file\collegamenti\'') 
  incollaa = "".join([inc, new_dir,' ',b])
  i=0
  
  while True:
       try:
            if i==10:  i=0
            time.sleep(1)          
            copiaa = "".join([a, alfabeto[i]])
            i=i+1
            shutil.copytree(copiaa,incollaa)
            if not os.path.exists(new_dir):  
                   os.makedirs(new_dir)
  
  
            break
       except FileNotFoundError:
            pass
  </code></pre>