Node.js (npm) refuses to find python even after %PYTHON% has been set

Question

So I am trying to get the Node.js to work. Of course, it's not as easy as advertised:)

I happen to have two python versions on my computer, but Node.js seems to only work with the older one, 2.7. Upon error, it also encourages me to set the path into PYTHON environment variable with this error:

Error: Can't find Python executable "python2.7", you can set the PYTHON env variable.

Ok then, I configured the variable as desired:

C:\Users\Jakub>set PYTHON=C:\MYSELF\Programs\Python2.7\python.exe

C:\Users\Jakub>echo %PYTHON%
C:\MYSELF\Programs\Python2.7\python.exe

You can see that I used echo to check whether the variable was really set. Unfortunatelly, that npm thing can't read it and the error appears again. Here's the full log right after I set the %PYTHON% variable:

C:\Users\Jakub>npm install minecraft-protocol
\


> ursa@0.8.5 install C:\Users\Jakub\node_modules\minecraft-protocol\node_modules\ursa
> node-gyp rebuild

|
C:\Users\Jakub\node_modules\minecraft-protocol\node_modules\ursa>if not defined npm_config_node_gyp (node "C:\Program Files (x86)\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..\no
de_modules\node-gyp\bin\node-gyp.js" rebuild )  else (rebuild)
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "python2.7", you can set the PYTHON env variable.
gyp ERR! stack     at failNoPython (C:\Program Files (x86)\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:103:14)
gyp ERR! stack     at C:\Program Files (x86)\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:64:11
gyp ERR! stack     at FSReqWrap.oncomplete (evalmachine.<anonymous>:95:15)

Answer 1

I figured out the most stable solution is to set python npm internal value to actual path:

npm config set python C:\Programs\Python2.7\python2.7.exe

This skips all environment variable and %PATH% crap and just starts the python wherever it's installed.

Answer 2

TL;DR Make a copy or alias of your python.exe with name python2.7.exe

My python 2.7 was installed as

D:\app\Python27\python.exe

I always got this error no matter how I set (and verified) PYTHON env variable:

gyp ERR! stack Error: Can't find Python executable "python2.7", you can set the PYTHON env variable.
gyp ERR! stack     at failNoPython (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:103:14)

The reason for this was that in node-gyp's configure.js the python executable was resolved like:

var python = gyp.opts.python || process.env.PYTHON || 'python'

And it turned out that gyp.opts.python had value 'python2.7' thus overriding process.env.PYTHON.

I resolved this by creating an alias for python.exe executable with name node-gyp was looking for:

D:\\app\\Python27>mklink python2.7.exe python.exe

You need admin rights for this operation.

Answer 3

在 Windows 的情况下设置环境变量后重新打开终端，但在 linux 的情况下无需重新启动终端。

Answer 4

This worked for me:

npm config set python C:\Users\<username>\.windows-build-tools\python27\python.exe

Set the path to python executable accordingly. Hope this help :-)

Answer 5

在 Windows 上，转到目录C:\\Users\\<<your username>>\\.windows-build-tools\\python27 python.2.7.exe并将python.exe作为python.2.7.exe复制并粘贴到同一目录中。

Answer 6

I tried everything but none worked for me, then I installed python using this Link at this location C:\Python27\python.exe