jupyter笔记本文件未找到错误-在错误的anaconda目录中查找

Question

我在打开笔记本文件时遇到问题。Jupyter notebook在查找Python时给我一个FileNotFoundError错误：

Traceback (most recent call last):
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/notebook/base/handlers.py", line 503, in wrapper
        result = yield gen.maybe_future(method(self, *args, **kwargs))
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/gen.py", line 1015, in run
        value = future.result()
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/concurrent.py", line 237, in result
        raise_exc_info(self._exc_info)
      File "<string>", line 3, in raise_exc_info
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/gen.py", line 1021, in run
        yielded = self.gen.throw(*exc_info)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/notebook/services/sessions/handlers.py", line 75, in post
        type=mtype))
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/gen.py", line 1015, in run
        value = future.result()
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/concurrent.py", line 237, in result
        raise_exc_info(self._exc_info)
      File "<string>", line 3, in raise_exc_info
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/gen.py", line 1021, in run
        yielded = self.gen.throw(*exc_info)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/notebook/services/sessions/sessionmanager.py", line 79, in create_session
        kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/gen.py", line 1015, in run
        value = future.result()
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/concurrent.py", line 237, in result
        raise_exc_info(self._exc_info)
      File "<string>", line 3, in raise_exc_info
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/gen.py", line 1021, in run
        yielded = self.gen.throw(*exc_info)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/notebook/services/sessions/sessionmanager.py", line 92, in start_kernel_for_session
        self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/gen.py", line 1015, in run
        value = future.result()
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/concurrent.py", line 237, in result
        raise_exc_info(self._exc_info)
      File "<string>", line 3, in raise_exc_info
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/tornado/gen.py", line 285, in wrapper
        yielded = next(result)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/notebook/services/kernels/kernelmanager.py", line 87, in start_kernel
        super(MappingKernelManager, self).start_kernel(**kwargs)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/jupyter_client/multikernelmanager.py", line 110, in start_kernel
        km.start_kernel(**kwargs)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/jupyter_client/manager.py", line 257, in start_kernel
        **kw)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/jupyter_client/manager.py", line 203, in _launch_kernel
        return launch_kernel(kernel_cmd, **kw)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/site-packages/jupyter_client/launcher.py", line 128, in launch_kernel
        proc = Popen(cmd, **kwargs)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/subprocess.py", line 707, in __init__
        restore_signals, start_new_session)
      File "/Users/myusername/anaconda/envs/dlnd/lib/python3.6/subprocess.py", line 1326, in _execute_child
        raise child_exception_type(errno_num, err_msg)
    FileNotFoundError: [Errno 2] No such file or directory: '/Users/myusername/anaconda3/envs/py3/bin/python'

我在网上听课。我首先创建了一个conda环境，如下所示：

conda create --name dlnd python=3
source activate dlnd
conda install numpy matplotlib pandas jupyter notebook

然后我尝试打开类中给定的文件：

jupyter notebook dlnd-your-first-neural-network.ipynb

当错误发生的时候。

我怀疑问题是我没有/Users/myusername/anaconda3/目录（因此FileNotFoundError）。我所有的水蟒资料都安装在/Users/myusername/anaconda/中，我已经使用jupyter笔记本几周了，在各种环境中运行各种.ipynb文件，没有大问题。

我不确定为什么jupyter notebook会在特定实例中查找anaconda3/。我试过重新安装，但是所有的东西都安装在/Users/myusername/anaconda/。

有经验的人知道我错过了什么吗？

在10.11上使用Macbook pro

Answer 1

基于@NehalJWanisuggested post，我找到了/Users/myusername/Library/Jupyter/kernels/python3/kernal.json，如下所示：

{
 "argv": [
  "/Users/myusername/anaconda3/envs/py3/bin/python",
  "-m",
  "ipykernel",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3",
 "language": "python"
}

并将其修改为指定anaconda，而不是anaconda3：

{
 "argv": [
  "/Users/myusername/anaconda/envs/py3/bin/python",
  "-m",
  "ipykernel",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3",
 "language": "python"
}

尝试重新运行jupyter笔记本时，出现的新错误是：

FileNotFoundError: [Errno 2] No such file or directory: 
'/Users/myusername/anaconda/envs/py3/bin/python'

这是朝着正确方向迈出的一步，因为至少现在我们正在寻找anaconda，而不是anaconda3。但是，它也在envs/py3/中查找，而我没有py3环境。

查看像@darthbeth这样的.ipynb文件，文件元数据是：

"metadata": {
  "anaconda-cloud": {},
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.0"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}

我看到这里指定了python3内核，但没有指定py3环境。

最终，我只是创造了一个py3环境来代替我想要的dlnd环境：

conda create -n py3 python=3

再次尝试运行笔记本时，出现以下错误：

/Users/myusername/anaconda/envs/py3/bin/python:
No module named ipykernel

所以我只需要安装ipykernal以及我最终需要的其他依赖项：

conda install ipykernel numpy matplotlib pandas jupyter notebook

现在它开始工作了。