Python 3: copy to target location

copy_to_target_location.py

#scan a directory iteratively, copy particular file to a new directory
#tested under Python3
import os
import os.path
import shutil

def copy_file(item, sou_dir, des_dir, type):
    (filepath, filename) = os.path.split(item)
    if type == os.path.splitext(filename)[1]:
        sourcefile = os.path.join(sou_dir, item)
        targetfile = os.path.join(des_dir, filename)
        if not os.path.exists(des_dir):
            os.makedirs(des_dir)
        shutil.copyfile(sourcefile, targetfile)
        print('Success: ' + sourcefile + ' to ' + targetfile)
    else:
        return

def find_and_operate(sou_dir, des_dir, type):
    for item in os.listdir(sou_dir):
        subdir = os.path.join(sou_dir, item)
        if os.path.isfile(subdir):
            copy_file(item, sou_dir, des_dir, type)
        else:
            find_and_operate(subdir, des_dir, type)

if __name__ == '__main__':
    source = input('source directory:')
    destination = input('destination directory:')
    type = input('filetype:')
    find_and_operate(source, destination, type)
    print('Done')