gyp ERR! configure error 
gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
gyp ERR! stack     at failNoPython (C:\Users\Clement\AppData\Roaming\npm\node_modules\npm\node_modules\node-gyp\lib\configure.js:449:14)
gyp ERR! stack     at C:\Users\Clement\AppData\Roaming\npm\node_modules\npm\node_modules\node-gyp\lib\configure.js:404:11
gyp ERR! stack     at FSReqWrap.oncomplete (fs.js:82:15)
gyp ERR! System Windows_NT 10.0.14393
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\Clement\\AppData\\Roaming\\npm\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd C:\Users\Clement\Documents\Cours\DEV1\leapzik_maker\node_modules\ws
gyp ERR! node -v v4.2.1
gyp ERR! node-gyp -v v3.4.0
gyp ERR! not ok