Add warning / error message when running in not-suitable python version

[martinheidegger]

#315
#324

are both bugs referring to node-gyp running in the wrong python version. This can removed stress by adding an error output stating which version of python at which path node-gyp uses.

[JayBeavers]

Can you restate this as a pull request? :-)

[berleant]

Relatedly--it'd be awesome if node-gyp could use python 3.

[bnoordhuis]

Since node-gyp has been printing that warning for years now, I'll go ahead and close this out.

@shoshber Unlikely to happen anytime soon.

[StoneCypher]

i see no such warning message

C:\Users\john\projects\(censored)\node_modules\integer>if not defined npm_config_node_gyp (node "C:\Users\john\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild )  else (node "C:\Users\john\AppData\Roaming\npm\node_modules\npm\node_modules\node-gyp\bin\node-gyp.js" rebuild )
gyp ERR! configure error
gyp ERR! stack Error: Command failed: C:\Users\john\Anaconda3\python.EXE -c import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack   File "<string>", line 1
gyp ERR! stack     import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack                                ^
gyp ERR! stack SyntaxError: invalid syntax
gyp ERR! stack
gyp ERR! stack     at ChildProcess.exithandler (child_process.js:272:12)
gyp ERR! stack     at ChildProcess.emit (events.js:160:13)
gyp ERR! stack     at maybeClose (internal/child_process.js:943:16)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:220:5)
gyp ERR! System Windows_NT 10.0.17134
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\john\\AppData\\Roaming\\npm\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd C:\Users\john\projects\(censored)\node_modules\integer
gyp ERR! node -v v9.4.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok

[richardlau]

@StoneCypher that will be fixed by #1534.

[northeusunshine]

Dear all
What's the reason for the error message which i also got when exec npm i ? Does it mean node-gpy can not work with python3?
Thanks!