为什么在Jupyter中未列出某些内核？

Question

Jupyter中未列出我的一个内核，我想知道如何在其中显示它。

运行jupyter kernelspec list给出

Available kernels:
  python3       /usr/local/etc/jupyter/kernels/python3
  haskell       /Users/Rax/Library/Jupyter/kernels/haskell
  qiskit_env    /Users/Rax/Library/Jupyter/kernels/qiskit_env
  python2       /usr/local/share/jupyter/kernels/python2

但是在Jupyter中，我没有列出python3：

为什么python3不见了？

另外：

• 根据运行jupiter-notebook的位置，此行为似乎有所不同：如果从新的“终端”窗口启动，则会获得完整列表。
• 显示缩写列表时，我无法切换到某些内核（即使它们已在Jupyter中列出）。

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对于上下文jupyter --paths给出

config:
    /Users/Rax/.jupyter
    /usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/etc/jupyter
    /usr/local/etc/jupyter
    /etc/jupyter
data:
    /usr/local/etc/jupyter
    /Users/Rax/Library/Jupyter
    /usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/share/jupyter
    /usr/local/share/jupyter
    /usr/share/jupyter
runtime:
    /Users/Rax/Library/Jupyter/runtime