卸载anaconda后出现Ipython内核错误答案

【问题标题】：Ipython kernel error after uninstalling anaconda卸载anaconda后出现Ipython内核错误
【发布时间】：2016-06-12 09:19:17
【问题描述】：

我在 ubuntu 14.04 上。我正在运行 anaconda，并使用conda 命令（根据this post）使python 2 和python 3 在ipython 笔记本中都可用。但我只是卸载了 anaconda 并在 virtualenv 中分别安装了 ipython、jupyter 和 notebook。现在，当我尝试创建新笔记本时，出现以下错误。正如您在最后一行中看到的，它似乎仍然是指使用 anaconda 创建的内核，自从我卸载 anaconda 后，它显然不再存在。

有人可以帮我解决这个问题吗？非常感谢。

 Traceback (most recent call last):
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/notebook/base/handlers.py", line 458, in wrapper
    result = yield gen.maybe_future(method(self, *args, **kwargs))
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/gen.py", line 1008, in run
    value = future.result()
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/concurrent.py", line 232, in result
    raise_exc_info(self._exc_info)
  File "<string>", line 3, in raise_exc_info
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/gen.py", line 1014, in run
    yielded = self.gen.throw(*exc_info)
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/notebook/services/sessions/handlers.py", line 58, in post
    sm.create_session(path=path, kernel_name=kernel_name))
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/gen.py", line 1008, in run
    value = future.result()
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/concurrent.py", line 232, in result
    raise_exc_info(self._exc_info)
  File "<string>", line 3, in raise_exc_info
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/gen.py", line 1014, in run
    yielded = self.gen.throw(*exc_info)
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/notebook/services/sessions/sessionmanager.py", line 73, in create_session
    self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/gen.py", line 1008, in run
    value = future.result()
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/concurrent.py", line 232, in result
    raise_exc_info(self._exc_info)
  File "<string>", line 3, in raise_exc_info
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/tornado/gen.py", line 282, in wrapper
    yielded = next(result)
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/notebook/services/kernels/kernelmanager.py", line 87, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/jupyter_client/multikernelmanager.py", line 109, in start_kernel
    km.start_kernel(**kwargs)
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/jupyter_client/manager.py", line 244, in start_kernel
    **kw)
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/jupyter_client/manager.py", line 190, in _launch_kernel
    return launch_kernel(kernel_cmd, **kw)
  File "/home/joe/.virtualenvs/crissp/lib/python3.4/site-packages/jupyter_client/launcher.py", line 123, in launch_kernel
    proc = Popen(cmd, **kwargs)
  File "/usr/lib/python3.4/subprocess.py", line 859, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.4/subprocess.py", line 1457, in _execute_child
    raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: '/home/joe/anaconda3/envs/py27/bin/python'

【问题讨论】：

运行jupyter kernelspec list，它会告诉你内核规范安装在哪里。您需要删除现在不正确的文件夹。或者用你现在安装的 ipython 安装一个新的 kernelspec。
我删除了jupyter kernelspec list 列出的内核规范，然后用jupyter kernelspec install-self --user 安装了一个新的内核规范，现在它可以工作了。谢谢！
太棒了。我已将其作为答案重新发布，以便在列表中显示为已回答。

标签： ipython anaconda jupyter jupyter-notebook

【解决方案1】：

运行jupyter kernelspec list，它应该会告诉您内核规范的安装位置。您需要删除现在不正确的文件夹。

或者，如in the IPython docs 所述，使用您现在安装的 ipython 安装新的内核规范。这将替换已为该版本的 Python 安装的 kernelspec。

【讨论】：