Ipython 笔记本 - 导入错误 : tornado

Question

我已经使用更新了 Tornado

sudo pip install --upgrade tornado

检查当前版本显示我已经有一个 4.0 以后的版本

找到命令的输出:

pip 显示 Tornado | grep 版本

Metadata-Version: 1.1
Version: 4.1

知道为什么 Ipython notebook 不工作并不断给我消息，我没有 tornado v4.1 而是有 3.0 版吗？。感谢致敬。

================================================== ========================
$ipython 笔记本

Traceback (most recent call last):
  File "/usr/local/bin/ipython", line 11, in <module>
    sys.exit(start_ipython())
  File "/usr/local/lib/python2.7/dist-packages/IPython/__init__.py", line 120, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 573, in launch_instance
    app.initialize(argv)
  File "<string>", line 2, in initialize
  File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 75, in catch_config_error
    return method(app, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 321, in initialize
    super(TerminalIPythonApp, self).initialize(argv)
  File "<string>", line 2, in initialize
  File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 75, in catch_config_error
    return method(app, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/IPython/core/application.py", line 369, in initialize
    self.parse_command_line(argv)
  File "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 316, in parse_command_line
    return super(TerminalIPythonApp, self).parse_command_line(argv)
  File "<string>", line 2, in parse_command_line
  File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 75, in catch_config_error
    return method(app, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 471, in parse_command_line
    return self.initialize_subcommand(subc, subargv)
  File "<string>", line 2, in initialize_subcommand
  File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 75, in catch_config_error
    return method(app, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 402, in initialize_subcommand
    subapp = import_item(subapp)
  File "/usr/local/lib/python2.7/dist-packages/IPython/utils/importstring.py", line 42, in import_item
    module = __import__(package, fromlist=[obj])
  File "/usr/local/lib/python2.7/dist-packages/IPython/html/notebookapp.py", line 50, in <module>
    raise ImportError(msg + ", but you have %s" % tornado.version)
ImportError: The IPython Notebook requires tornado >= 4.0, but you have 3.2

Answer 1

我也有一个相互冲突的 Tornado 副本(ubuntu 14.04 上的 3.1.1)。要查看您是否属于这种情况，请在终端中使用以下命令:
apt-cache policy python-tornado
打印出操作系统的版本。如果不是您想要的版本，请使用:
sudo apt-get remove python-tornado
删除它。如果您已经使用 pip 安装了较新的版本，该版本现在对 python 可见。