Python Launcher does not work for Python terminal or Python Interactive window

Environment data

• VS Code version: 1.31.0
• Extension version (available under the Extensions sidebar): 2019.1.0
• OS and version: Windows 7 Enterprise SP1, 64-bit
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.7.2 32-bit & Python 2.7.14 64-bit
• Type of virtual environment used (N/A | venv | virtualenv | conda | …): N/A
• Relevant/affected Python packages and their versions: (Python 3) jupyter-notebook 5.7.4; (Python 2) jupyter-notebook 5.2.2

Expected behaviour

Clicking “Run-Cell” above a note-book enabled snippet starts and runs Jupyter Notebook

Actual behaviour

Clicking “Run-Cell” triggers an error stating “Executing code failed : Error: Running cells requires Jupyter notebooks to be installed.”

Running py -m notebook from a cmd window and/or VSCode’s terminal starts jupyter notebook as expected for Python 3 and similarly py -2 -m notebook for Python 2.

Steps to reproduce:

1. Have at least Python 3 (for the launcher) installed using default options (Python Launcher on PATH, Python Executable not on PATH) and with jupyter-notebook module installed. Have no other versions of Python on PATH, only the launcher (C:\Windows\py.exe)
2. Select Python 3.x as interpreter.
3. Create a simple notebook snippet and try to run the cells

#%%
msg = "Hello World"
print(msg)

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

Starting Jedi Python language engine.

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help; turn on source maps to make any tracebacks be useful by running Enable source map support for extension debugging)

console.ts:134 [Extension Host] Python Extension: Cached data exists ActivatedEnvironmentVariables, <No Resource>

console.ts:134 [Extension Host] Python Extension: Cached data exists getEnvironmentVariables, <No Resource>

console.ts:134 [Extension Host] Python Extension: getActivatedEnvironmentVariables, Class name = S, Arg 1: undefined, Arg 2: {"architecture":2,"path":"C:\\Python37-32\\python.exe","version":{"raw":"3.7.2-final","major":3,"minor":7,"patch":2,"prerelease":["final"],"build":[],"version":"3.7.2-final"},"sysPrefix":"C:\\Python37-32","fileHash":"d84cbeced9380942287d24afb8ff1ca2b1eb881dd92e80f1e21a101cdf2c4f2aa28a2629baad07c6dbd1528b0bc445f6d2a52c9cd30baf402a76b89c82ecdd0b","companyDisplayName":"Python Software Foundation","type":"Unknown","displayName":"Python 3.7.2 32-bit"}

console.ts:134 [Extension Host] Python Extension: Cached data exists getEnvironmentVariables, <No Resource>

console.ts:134 [Extension Host] Python Extension: Activation Commands received undefined

console.ts:134 [Extension Host] Python Extension: getActivatedEnvironmentVariables, Class name = S, Arg 1: undefined, Arg 2: {"architecture":3,"path":"C:\\Python27\\python.exe","version":{"raw":"2.7.14-final","major":2,"minor":7,"patch":14,"prerelease":["final"],"build":[],"version":"2.7.14-final"},"sysPrefix":"C:\\Python27","fileHash":"45320b6ecc01ba85d63e7b3a68c02dfe545da607d62447b640dab7cdc589e0b7f087fd3a5b48c27eb06c6b9a9bda6a2326bf1e62e8b4c2d83f1ea190ec714a12","companyDisplayName":"Python Software Foundation","type":"Unknown","displayName":"Python 2.7.14 64-bit"}

console.ts:134 [Extension Host] Python Extension: Cached data exists getEnvironmentVariables, <No Resource>

console.ts:134 [Extension Host] Python Extension: Error: Error executing Jupyter command 'notebook': [Errno 'jupyter-notebook' not found] 2
 for C:\Python27\python.exe
t.log @ console.ts:134
e.$logExtensionHostMessage @ mainThreadConsole.ts:39
t._doInvokeHandler @ rpcProtocol.ts:390
t._invokeHandler @ rpcProtocol.ts:375
t._receiveRequest @ rpcProtocol.ts:295
t._receiveOneMessage @ rpcProtocol.ts:225
(anonymous) @ rpcProtocol.ts:100
e.fire @ event.ts:567
s @ ipc.net.ts:295
(anonymous) @ ipc.net.ts:302
e.fire @ event.ts:567
a @ ipc.net.ts:103
_socketDataListener @ ipc.net.ts:132
emit @ events.js:182
addChunk @ _stream_readable.js:279
readableAddChunk @ _stream_readable.js:264
Readable.push @ _stream_readable.js:219
onread @ net.js:636

console.ts:134 [Extension Host] Python Extension: Error: Error executing Jupyter command 'notebook': [Errno 'jupyter-notebook' not found] 2
 for C:\Python37-32\python.exe
t.log @ console.ts:134
e.$logExtensionHostMessage @ mainThreadConsole.ts:39
t._doInvokeHandler @ rpcProtocol.ts:390
t._invokeHandler @ rpcProtocol.ts:375
t._receiveRequest @ rpcProtocol.ts:295
t._receiveOneMessage @ rpcProtocol.ts:225
(anonymous) @ rpcProtocol.ts:100
e.fire @ event.ts:567
s @ ipc.net.ts:295
(anonymous) @ ipc.net.ts:302
e.fire @ event.ts:567
a @ ipc.net.ts:103
_socketDataListener @ ipc.net.ts:132
emit @ events.js:182
addChunk @ _stream_readable.js:279
readableAddChunk @ _stream_readable.js:264
Readable.push @ _stream_readable.js:219
onread @ net.js:636

console.ts:134 [Extension Host] Python Extension: Error: spawn jupyter ENOENT
t.log @ console.ts:134
e.$logExtensionHostMessage @ mainThreadConsole.ts:39
t._doInvokeHandler @ rpcProtocol.ts:390
t._invokeHandler @ rpcProtocol.ts:375
t._receiveRequest @ rpcProtocol.ts:295
t._receiveOneMessage @ rpcProtocol.ts:225
(anonymous) @ rpcProtocol.ts:100
e.fire @ event.ts:567
s @ ipc.net.ts:295
(anonymous) @ ipc.net.ts:302
e.fire @ event.ts:567
a @ ipc.net.ts:103
_socketDataListener @ ipc.net.ts:132
emit @ events.js:182
addChunk @ _stream_readable.js:279
readableAddChunk @ _stream_readable.js:264
Readable.push @ _stream_readable.js:219
onread @ net.js:636

notificationsAlerts.ts:40 Executing code failed : Error: Running cells requires Jupyter notebooks to be installed.

[bcoov]

@IanMatthewHuff Apologies for the delay. Finally got a chance to test out the 2019.3.6139 merged fix - everything looks good on my end! 😄

[bcoov]

Thanks for the update @IanMatthewHuff! I added the Scripts directory to my PATH to try the workaround you suggested. After restarting VSCode and trying to run the cell, it sat there reporting “Starting Jupyter Server” indefinitely. However, after another restart, running the cell again started up the server instance and ran as expected.