python模块命名

最近在学习python，廖雪峰同窗的博客很不错，在跟着写一个blog的时候搭建web框架时遇到以下问题，作一下记录

项目结构如图

此时运行报错以下：

"D:\Program Files\Python3.5\python.exe" D:\lhh\python\web\www\copy.py
Traceback (most recent call last):
  File "D:\lhh\python\web\www\copy.py", line 3, in <module>
    import asyncio, os, json, time
  File "D:\Program Files\Python3.5\lib\asyncio\__init__.py", line 21, in <module>
    from .base_events import *
  File "D:\Program Files\Python3.5\lib\asyncio\base_events.py", line 18, in <module>
    import concurrent.futures
  File "D:\Program Files\Python3.5\lib\concurrent\futures\__init__.py", line 17, in <module>
    from concurrent.futures.process import ProcessPoolExecutor
  File "D:\Program Files\Python3.5\lib\concurrent\futures\process.py", line 55, in <module>
    from multiprocessing.connection import wait
  File "D:\Program Files\Python3.5\lib\multiprocessing\connection.py", line 18, in <module>
    import tempfile
  File "D:\Program Files\Python3.5\lib\tempfile.py", line 43, in <module>
    import shutil as _shutil
  File "D:\Program Files\Python3.5\lib\shutil.py", line 13, in <module>
    import tarfile
  File "D:\Program Files\Python3.5\lib\tarfile.py", line 49, in <module>
    import copy
  File "D:\lhh\python\web\www\copy.py", line 6, in <module>
    from aiohttp import web
  File "D:\Program Files\Python3.5\lib\site-packages\aiohttp\__init__.py", line 7, in <module>
    from .protocol import *  # noqa
  File "D:\Program Files\Python3.5\lib\site-packages\aiohttp\protocol.py", line 14, in <module>
    from . import errors, hdrs
  File "D:\Program Files\Python3.5\lib\site-packages\aiohttp\errors.py", line 3, in <module>
    from asyncio import TimeoutError
ImportError: cannot import name 'TimeoutError'

注意，我运行的是app.py,可是此时报错的是copy.py。是由于copy这个模块名和系统的重复了，致使报错。但愿对遇到一样错误的人有用。