在 jupyter notebook 上启动内核失败

Question

我通过 Homebrew 安装了 python 版本 3.6.5_1 和 3.7.0。
jupyter 需要 python3.6 才能启动。如果我切换到 python3.7，它将无法启动。

启动后，内核启动失败。给出这个错误：

Traceback (most recent call last):
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/web.py", line 1543, in _execute
result = yield result
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/gen.py", line 1099, in run
value = future.result()
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/gen.py", line 1107, in run
yielded = self.gen.throw(*exc_info)
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/lib/python3.6/site-packages/notebook/services/sessions/handlers.py", line 73, in post
type=mtype))
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/gen.py", line 1099, in run
value = future.result()
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/gen.py", line 1107, in run
yielded = self.gen.throw(*exc_info)
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/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 "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/gen.py", line 1099, in run
value = future.result()
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/gen.py", line 1107, in run
yielded = self.gen.throw(*exc_info)
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/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 "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/gen.py", line 1099, in run
value = future.result()
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/vendor/lib/python3.6/site-packages/tornado/gen.py", line 315, in wrapper
yielded = next(result)
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/lib/python3.6/site-packages/notebook/services/kernels/kernelmanager.py", line 148, in start_kernel
super(MappingKernelManager, self).start_kernel(**kwargs)
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/lib/python3.6/site-packages/jupyter_client/multikernelmanager.py", line 110, in start_kernel
km.start_kernel(**kwargs)
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/lib/python3.6/site-packages/jupyter_client/manager.py", line 259, in start_kernel
**kw)
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/lib/python3.6/site-packages/jupyter_client/manager.py", line 204, in _launch_kernel
return launch_kernel(kernel_cmd, **kw)
File "/usr/local/Cellar/jupyter/1.0.0_4/libexec/lib/python3.6/site-packages/jupyter_client/launcher.py", line 128, in launch_kernel
proc = Popen(cmd, **kwargs)
File "/usr/local/Cellar/python/3.6.5_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 709, in __init__
restore_signals, start_new_session)
File "/usr/local/Cellar/python/3.6.5_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1344, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/opt/python/bin/python3.7': '/usr/local/opt/python/bin/python3.7'

据我了解，内核正在寻找 python3.7。我的内核列表只有 python3

$jupyter kernelspec list  
Available kernels:  
python3    /usr/local/etc/jupyter/kernels/python3  

我查看了this link on github，但没有帮助。如何让 jupyter 和内核在同一个 python 版本上运行？

Answer 1

查看内核规范：

$jupyter kernelspec list

这将向您显示可用的内核。在这种情况下：

python3    /usr/local/etc/jupyter/kernels/python3  

打开该目录下的kernel.json文件，在argv键中指定你希望内核使用的python路径。

Answer 2

更新 jupyter notebook 为我解决了这个问题。 但请记住，使用命令行更新它。不是 Anaconda 导航器

pip install -U jupyter

Answer 3

第 2 步命令：-“conda activate（您的 env 文件夹的位置）” 第 3 步命令：-“python -m ipykernel install --user”

作品

Answer 4

如果有人在 Anaconda 中运行 Jupyter Notebook 并收到相同的错误：

我通过在命令提示符（不是 anaconda 提示符）中使用 pip 安装 Jupyter 找到了一种解决方法：

$pip install jupyter

然后使用已知方式启动 Jupyter

$cd 'DirectoryofyourNotebook'
$jupyter notebook

Answer 5

我遇到了同样的问题 - 尝试了以上所有方法都没有成功。

背景：在这台机器上使用 Windows 已经有几年了。我将这台机器用作“需要时随时随地使用代码”的笔记本电脑，并且在安装/升级 python 版本或库或环境时并没有非常小心或始终如一。

对我的修复 - 不知何故，包含 f2py.exe（Numpy - 在其之上构建 Pandas）的文件夹不在路径中，并且位于以“\”结尾的隐藏文件夹中脚本”。 Python 本身在环境变量中很好。它们位于非常不同的文件夹中 - 而通常它们应该位于文件夹树中的紧密分支中。添加以“\Scripts”结尾且环境变量中包含 f2py.exe 的文件夹的完整路径为我解决了内核问题。