Failed to start the kernel on jupyter notebook

Question

Through homebrew, I have installed the python version 3.6.5_1. Then I realized that jupyter can be launched on 3.6 so I had to switch to python 3.7

When I launched jupyter the kernel is giving error as shown:

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'

From my understanding, the kernel is looking for python version 3.7. It lists as:

$jupyter kernelspec list  

Available kernels:  

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

Answer 1

You need to check the kernel specifications:

$jupyter kernelspec list

The below command will show you the available kernel.

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

Now the kernel.json file in the above directory and provide the path of the python you wanted the kernel to work.

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