如何在python中复制文件夹

def copytree(src, dst, symlinks=False, ignore=None):
  names = os.listdir(src)
  if ignore is not None:
    ignored_names = ignore(src, names)
  else:
    ignored_names = set()
  os.makedirs(dst)
  errors = []
  for name in names:
    if name in ignored_names:
      continue
    srcname = os.path.join(src, name)
    dstname = os.path.join(dst, name)
    try:
      if symlinks and os.path.islink(srcname):
        linkto = os.readlink(srcname)
        os.symlink(linkto, dstname)
      elif os.path.isdir(srcname):
        copytree(srcname, dstname, symlinks, ignore)
      else:
        copy2(srcname, dstname)
      # XXX What about devices, sockets etc.?
    except (IOError, os.error) as why:
      errors.append((srcname, dstname, str(why)))
    # catch the Error from the recursive copytree so that we can
    # continue with other files
    except Error as err:
      errors.extend(err.args[0])
  try:
    copystat(src, dst)
  except WindowsError:
    # can't copy file access times on Windows
    pass
  except OSError as why:
    errors.extend((src, dst, str(why)))
  if errors:
    raise Error(errors)