Display place holder kernel for `Python` when Python extension Or Python runtime isn't installed

[DonJayamanne]

Refs: #5864

• anyOS @kieferrm
• anyOS @alexr00

Complexity: 3

Create Issue

---

If users do not have Python extension installed, and they open a Jupyter notebook, they do not know what they need to do to be able to run a Notebook with Python.
Solution:

• If users do not have Python extension installed, we list a kernel named Python and when this kernel is used to run a notebook cell, they'll be prompted to install the Python extension.
• If users have the Python Extension installed but do not have any Python runtime (environment) on their machine, we list a kernel named Python and when this kernel is used to run a notebook cell, they'll be prompted to install the Python runtime.

Testing

Test 1 (with Python runtime)

• Ensure you do not have Python extension installed
• Ensure you have Python installed.
• Install VS Code Insiders
• Open a Jupyter Notebook
• Verify you do not have any Python kernels
  • Next select the kernel Python
  • Now attempt to run a cell.
  • Verify you are prompted to install Python extension
  • Once installed, verify the list of Python interpreters are now displayed in the kernel picker (without having to re-load VS Code)

Test 2 (without Python runtime)

• Ensure you do not have Python extension installed
• Ensure you do not have Python installed.
• Install VS Code Insiders
• Open a Jupyter Notebook
• Verify you do not have any Python kernels
  • Next select the kernel Python
  • Now attempt to run a cell.
  • Verify you are prompted to install Python extension
• Re-load VS Code, & open the same notebook.
• Verify you do not have any Python kernels
  • Next select the kernel Python
  • Now attempt to run a cell.
  • Verify you are prompted to install Python runtime

[alexr00]

Tested on Windows.