将使用python-shell的Node.js应用程序部署到Heroku

我有一个node.js应用程序，该应用程序可以部署到heroku并运行良好（有一个简单的Procfile，内容为 web：npm start 。

I have a node.js application that deploys to heroku and runs well (has a simple Procfile that says web: npm start.

我同时设置了node.js和Python buildpacks。

I have both the node.js and Python buildpacks set.

我有 PYTHONPATH 配置变量设置为 / usr / bin / python 。

我有的要求.txt 在我的应用主目录中，该目录指定了我需要的内容（我什至包括了最新版本的）。

I have the requirements.txt in my app home directory that specifies the stuff I need (I even included the latest version of gunicorn).

但是，当需要调用python shell时，这就是我得到的：

However, when it comes time to invoke the python shell, this is what I get:

2019-04-11T02:46:14.680872+00:00 app[web.1]: { Error: ImportError: No module named site
2019-04-11T02:46:14.680933+00:00 app[web.1]: 
2019-04-11T02:46:14.680937+00:00 app[web.1]:     at PythonShell.parseError (/app/node_modules/python-shell/index.js:254:21)
2019-04-11T02:46:14.680939+00:00 app[web.1]:     at terminateIfNeeded (/app/node_modules/python-shell/index.js:129:32)
2019-04-11T02:46:14.680941+00:00 app[web.1]:     at ChildProcess.<anonymous> (/app/node_modules/python-shell/index.js:121:13)
2019-04-11T02:46:14.680942+00:00 app[web.1]:     at ChildProcess.emit (events.js:189:13)
2019-04-11T02:46:14.680944+00:00 app[web.1]:     at Process.ChildProcess._handle.onexit (internal/child_process.js:248:12)
2019-04-11T02:46:14.680945+00:00 app[web.1]:   executable: '/usr/bin/python',
2019-04-11T02:46:14.680947+00:00 app[web.1]:   options: [ '-u' ],
2019-04-11T02:46:14.680949+00:00 app[web.1]:   script: '/app/routes/resgraph.py',
2019-04-11T02:46:14.680950+00:00 app[web.1]:   args: [ '2', 'ribozyme', 'hatchet' ],
2019-04-11T02:46:14.680952+00:00 app[web.1]:   exitCode: 1 }
2019-04-11T02:46:14.681384+00:00 app[web.1]: results: undefined

基本上，然后我的应用程序其余部分失败，因为我需要结果待定义。

Basically, then the rest of my app fails, since I need results to be defined.

为什么会这样？

这是调用python shell的代码部分：

This is the part of the code that invokes the python shell:

/* returns graph information for a certain query. */
router.get('/', function(req, response, next) {

    // get the query string
    query_string = req.query.query;
    let options = {
      mode: 'text',
      pythonPath: process.env.PYTHONPATH,
      pythonOptions: ['-u'], // get print results in real-time
      scriptPath: '/app/routes',
      args: [req.query.depth].concat(query_string.split(' '))
    };

    PythonShell.run('/resgraph.py', options, function (err, results) {
      if (err) console.log(err);
      // results is an array consisting of messages collected during execution
      console.log('results: %j', results);
      response.json(JSON.parse(results[1]));
    });

});