Python脚本的Node.js child_process执行导致导入模块错误

Question

在node.js 中使用child_process.spawn 通过电子应用程序（node.js）执行python 脚本。如果我在终端（macOS）上运行 python 脚本没有问题，但是，使用node.js 和：

const spawn = require('child_process').spawn
let ls = spawn('python', ['runserver.py','--help'], {
  cwd: __dirname,
  detached: true
})

我从python 收到模块导入失败的错误，例如：

Traceback (most recent call last):
  File "runserver.py", line 17, in <module>
    from queue import Queue
ImportError: No module named queue

我已经尝试过设置不同的环境，但没有成功。

编辑：

这里是sys.path的日志：

• 通过child_process执行代码

  [
    '/Users/xAlien95/Desktop/test.app/Contents/Resources/app',
    '/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
    '/Library/Python/2.7/site-packages',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
    '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC'
  ]
  

• 通过终端执行代码

  [
    '/Users/xAlien95/Desktop/test.app/Contents/Resources/app',
    '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
    '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
    '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
    '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
    '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
    '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
    '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
    '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
    '/usr/local/lib/python2.7/site-packages',
    '/usr/local/Cellar/protobuf/3.1.0/libexec/lib/python2.7/site-packages'
  ]
  

因此，在终端中它使用homebrew 下载的 Python 框架。我如何确保node.js 应用程序中也会发生同样的情况？

Answer 1

让 python 找到不同库的一种方法是使用环境变量PYTHONPATH。您可以在 node.js 中使用 process.env.PYTHONPATH

进行设置

(DOCS) (SOURCE)

对于想要运行homebrew 安装的python 的特定情况，python 可执行文件应该在：

let ls = spawn(process.env.HOMEBREW_PREFIX + '/bin/python', ['runserver.py','--help'], {
    ...

如果HOMEBREW_PREFIX 在process.env 中不可用，并且所需python 的路径已知，则可以将其硬编码到spawn 中：

let ls = spawn(/*<Where my python lives>*/ + '/bin/python', ['runserver.py','--help'], {
    ...