asyncio引起的torando运行出错{!r}_format(fileobj))_from_None

今天启动torando的web.py,发现出错,一直这样没问题,后来发现是前2天测试的时候安装了库asyncio与torando的冲突了,删除pip uninstall asyncio即可解决.

>> python web.py
Traceback (most recent call last):
  File "/home/randy/web.py", line 4, in <module>
    import tornado.httpserver
  File "/usr/local/lib/python2.7/dist-packages/tornado-4.3-py2.7-linux-x86_64.egg/tornado/httpserver.py", line 34, in <module>
    from tornado.http1connection import HTTP1ServerConnection, HTTP1ConnectionParameters
  File "/usr/local/lib/python2.7/dist-packages/tornado-4.3-py2.7-linux-x86_64.egg/tornado/http1connection.py", line 28, in <module>
    from tornado import gen
  File "/usr/local/lib/python2.7/dist-packages/tornado-4.3-py2.7-linux-x86_64.egg/tornado/gen.py", line 1236, in <module>
    import tornado.platform.asyncio
  File "/usr/local/lib/python2.7/dist-packages/tornado-4.3-py2.7-linux-x86_64.egg/tornado/platform/asyncio.py", line 33, in <module>
    import asyncio
  File "/usr/local/lib/python2.7/dist-packages/asyncio/__init__.py", line 9, in <module>
    from . import selectors
  File "/usr/local/lib/python2.7/dist-packages/asyncio/selectors.py", line 39
    "{!r}".format(fileobj)) from None
                               ^
SyntaxError: invalid syntax

参考链接: - https://github.com/jupyter/notebook/issues/824