python模塊命名

最近在學習python，廖雪峯同窗的博客很不錯，在跟着寫一個blog的時候搭建web框架時遇到以下問題，作一下記錄

項目結構如圖

此時運行報錯以下：

"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，我運行的是app.py,可是此時報錯的是copy.py。是由於copy這個模塊名和系統的重複了，致使報錯。但願對遇到一樣錯誤的人有用。