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Below is the error that I get, when I try to generate a new project with JHipster:

gyp verb check python checking for Python executable "python2" in the PATH
gyp verb `which` failed Error: not found: python2
gyp verb check python checking for Python executable "python" in the PATH
gyp verb `which` succeeded python C:\Program Files\Python36\python.EXE
gyp verb check python version `C:\Program Files\Python36\python.EXE -c "import platform; print(platform.python_version());"` returned: "3.6.4\r\n"
gyp verb could not find "C:\Program Files\Python36\python.EXE". checking python launcher
gyp verb could not find "C:\Program Files\Python36\python.EXE". guessing location
gyp verb ensuring that file exists: C:\Python27\python.exe
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "C:\Program Files\Python36\python.EXE", you can set the PYTHON env variable.
The rest is the stacktrace. The weird thing is I do have python installed and the environment variable is also set. My python version is "Python 3.6.4". Should I run it in Python 2? Is that the case?
Yes node-gyp requires Python 2.7, so you could try the answers to this question. 
Alternatively, if you encounter this problem, it is probably due to node-sass and if you did not select Sass in JHipster options, you don't need it but still you get it because it's a transitive dependency from Angular, you can skip it by setting environment variables:
set SKIP_SASS_BINARY_DOWNLOAD_FOR_CI=true
set SKIP_NODE_SASS_TESTS=true
Another alternative is to use JHipster devbox.
Delete your node_modules folder.
Run npm install --global windows-build-tools --save in your command prompt. 
Install node-sass using the command: npm install node-sass@4.12.0 --save (or the latest version)
This should solve the error and return you a gyp info ok message!
If you encounter Node Sass could not find a binding for your current environment, resolve it by running:
npm rebuild node-sass
Just a note for anyone using React and facing the same error on Linux (Ubuntu):
Step 1: Install python 2.7
something similar to this
 sudo apt update
 sudo apt install python2-minimal
Step 2: Install make or just build-essential
something like:
sudo apt-get install build-essential
Then you can proceed with your previous activity...
                This still seems relevant in 2021 on pretty up-to-date installations and versions of packages. Not sure why the underlying issue is not being fixed.
– MadPhysicist
                Jun 1, 2021 at 12:19
        
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