npm install fails if python not between 2.5.0 and 3.0.0

[dawnTestCode]

Here is the output if the python environment is 3.5.0:

> msgpack@1.0.2 install /Users/username/dev/unspecified/Coval.js/node_modules/msgpack
> node-gyp rebuild

gyp ERR! configure error 
gyp ERR! stack Error: Python executable "/Users/username/.pyenv/shims/python" is v3.5.0, which is not supported by gyp.
gyp ERR! stack You can pass the --python switch to point to Python >= v2.5.0 & < 3.0.0.
gyp ERR! stack     at PythonFinder.failPythonVersion (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:492:19)
gyp ERR! stack     at PythonFinder.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:474:14)
gyp ERR! stack     at ChildProcess.exithandler (child_process.js:264:7)
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 Socket.stream.socket.on (internal/child_process.js:363:11)
gyp ERR! stack     at Socket.emit (events.js:160:13)
gyp ERR! stack     at Pipe._handle.close [as _onclose] (net.js:559:12)
gyp ERR! System Darwin 17.3.0
gyp ERR! command "/usr/local/Cellar/node/9.4.0/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /Users/username/dev/unspecified/Coval.js/node_modules/msgpack
gyp ERR! node -v v9.4.0
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok 
npm WARN secret-share@1.0.0 No repository field.

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! msgpack@1.0.2 install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the msgpack@1.0.2 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/username/.npm/_logs/2018-01-29T15_28_36_754Z-debug.log