CSV manipulation with Python

I've prepared a script to manipulate csv files in Windows that simply adds quotes as requested.

The script creates a backup of the original files and overwrite the wrong originals in its same folder.

It works as expected but I'd be really happy to learn from gurus how to improve my code, my thinking and my Python.

#!/usr/bin/python
# coding: utf-8
#
#    ______________________________________
#   / CSV Fix                              \
#   \ LtPitt - 25/02/2015                  /
#    --------------------------------------
#           \   ^__^
#            \  (oo)\_______
#               (__)\       )\/\
#                   ||----w |
#                   ||     ||
#
# This script will fix the manually-edited csv files before import into application

import os
import csv
import shutil
import sys
import time

script_path = os.path.dirname(sys.argv[0])        
backup_path = script_path + "\\backup\\"
tmp_path = script_path + "\\tmp\\"

os.chdir(script_path)

paths = [backup_path, tmp_path]

for path in paths:
  if not os.path.exists(path):
    os.makedirs(path)

def fixCsv(csv_file):
  # This function fixes the broken csv adding ; and " where needed and saves the fixed file into the script path
  rows = []
  with open(tmp_path + csv_file, 'rb') as csvfile:
    spamreader = csv.reader(csvfile, delimiter=';', quotechar='"')
    for row in spamreader:
      if not ''.join(row).strip():
        pass
      else:
        rows.append(row)

  with open(script_path + "\\" + csv_file, 'wb') as csvfile:
    spamwriter = csv.writer(csvfile, delimiter=';', quotechar='"', quoting=csv.QUOTE_ALL)
    for row in rows:
      spamwriter.writerow(row)

def prepareFiles():
  # This function saves original files in case of errors / reviews and moves originals into tmp folder for elaboration
  current_datetime = str(time.strftime('%Y%m%d%H%M%S') )
  os.makedirs(backup_path + current_datetime)
  for file in os.listdir(script_path):
    if file.endswith(".csv"):
      shutil.copyfile(script_path + "\\" + file, backup_path + current_datetime + "\\" + file)
      shutil.move(script_path + "\\" + file, tmp_path + "\\" + file)

# Let's rock
prepareFiles()
for file in os.listdir(tmp_path):
  if file.endswith(".csv"):
    fixCsv(file)
shutil.rmtree(tmp_path)