import os
import shutil
from distutils import dir_util

target_folder = "c:\\bin"
source_folder1 = "c:\\copy_from1"
source_folder2 = "c:\\copy_from2"

os.makedirs(target_folder)
dir_util.copy_tree(source_folder1, target_folder)
shutil.rmtree(target_folder)
os.makedirs(target_folder)
dir_util.copy_tree(source_folder2, target_folder)