ERR! configure error gyp ERR! stack Error: Can't find Python executable "python"

Node.js 在安装模块的时候报错，缺少python环境。

ERR! configure error gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.

错误信息如下：

D:\node_modules\selenium-webdriver\node_modules\ws\node_modules\utf-8-validate>node "D:\Program Files\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild
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 (D:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:103:14)
gyp ERR! stack     at D:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:64:11
gyp ERR! stack     at Object.oncomplete (fs.js:107:15)
gyp ERR! System Windows_NT 6.2.9200
gyp ERR! command "node" "D:\\Program Files\\nodejs\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd D:\node_modules\selenium-webdriver\node_modules\ws\node_modules\utf-8-validate
gyp ERR! node -v v0.10.29
gyp ERR! node-gyp -v v0.13.1
gyp ERR! not ok

原因看node-gyp的安装需求，https://github.com/nodejs/node-gyp， 部分剪切如下，可以请求的看到需要安装python2.7（其实2.6也行）python3不行

You can install with npm:

$ npm install -g node-gyp

You will also need to install:

• On Unix:

  • python (v2.7 recommended, v3.x.x is not supported)

  • make

  • A proper C/C++ compiler toolchain, like GCC

• On Mac OS X:

  • You also need to install the Command Line Tools via Xcode. You can find this under the menu Xcode -> Preferences -> Downloads

  • This step will install gcc and the related toolchain containing make

  • python (v2.7 recommended, v3.x.x is not supported) (already installed on Mac OS X)

  • Xcode

• On Windows:

  • For 64-bit builds of node and native modules you will also need the Windows 7 64-bit SDK

  • You may need to run one of the following commands if your build complains about WindowsSDKDir not being set, and you are sure you have already installed the SDK:

  • Microsoft Visual Studio C++ 2013 for Windows Desktop (Express version works well)

  • Microsoft Visual Studio C++ 2013 (Express version works well)

  • If the install fails, try uninstalling any C++ 2010 x64&x86 Redistributable that you have installed first

  • If you get errors that the 64-bit compilers are not installed you may also need thecompiler update for the Windows SDK 7.1

  • Make sure that you have a PYTHON environment variable, and it is set to drive:\path\to\python.exe not to a folder

  • Python (v2.7.3 recommended, v3.x.x is not supported)

  • Windows XP/Vista/7:

  • Windows 7/8:

  • All Windows Versions

call "C:\Program Files\Microsoft SDKs\Windows\v7.1\bin\Setenv.cmd" /Release /x86
call "C:\Program Files\Microsoft SDKs\Windows\v7.1\bin\Setenv.cmd" /Release /x64

If you have multiple Python versions installed, you can identify which Python version node-gyp uses by setting the '--python' variable:

$ node-gyp --python /path/to/python2.7

If node-gyp is called by way of npm and you have multiple versions of Python installed, then you can set npm's 'python' config key to the appropriate value:

$ npm config set python /path/to/executable/python2.7

Note that OS X is just a flavour of Unix and so needs python, make, and C/C++. An easy way to obtain these is to install XCode from Apple, and then use it to install the command line tools (under Preferences -> Downloads).

所以下载安装Python2.7就行了，记得配环境变量。

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