python - 在 Node.js 服务器上运行 Python 脚本时出错

Question

我有以下 Python 脚本:

import sys 
print("Output from Python") 
print("First name: " + sys.argv[1]) 
print("Last name: " + sys.argv[2]) 

我正在尝试从 Node.js 服务器调用此脚本，并且我已经在线阅读了两种执行此操作的方法:

第一个是使用 PythonShell:

const app = require('express')();
const ps = require('python-shell');

ps.PythonShell.run('hello.py', null, function (err, results) {
   if (err) throw err;
   console.log('finished');
   console.log(results);
});

app.listen(4000);

当尝试以这种方式实现它时，我收到以下错误:

PythonShell.run is not a function.

我不确定我在这里写的路径是否正确，但我确定我在服务器中写的路径是正确的。

第二种方法是使用child process:

var express = require('express'); 
var app = express(); 

  app.listen(3000, function() { 
  console.log('server running on port 3000'); 
} ) 

app.get('/name', callName); 
function callName(req, res) { 

var spawn = require("child_process").spawn; 
var process = spawn('python',["./hello.py", 
                    req.query.firstname, 
                    req.query.lastname] ); 


process.stdout.on('data', function(data) { 
    res.send(data.toString()); 
  } ) 
 } 

当尝试这种方式时，我收到以下错误:

Error: spawn python ENOENT at Process.ChildProcess._handle.onexit (internal/child_process.js:246:19) at onErrorNT (internal/child_process.js:421:16) at process.internalTickCallback (internal/process/next_tick.js:72:19) Emitted 'error' event at: at Process.ChildProcess._handle.onexit (internal/child_process.js:252:12) at onErrorNT (internal/child_process.js:421:16) at process.internalTickCallback (internal/process/next_tick.js:72:19)

有谁知道问题出在哪里吗？或者也许建议一个不同的选择？

Answer 1

看起来您提到的答案已经过时了。

试试这个:

const app = require('express')();
const {PythonShell} = require('python-shell');

PythonShell.run('hello.py', null, function (err, results) {
  if (err) throw err;
  console.log('finished');
  console.log(results);
});

app.listen(4000);

您的第二次尝试在几个地方都是错误的。 您可以尝试以下方法:

const express = require('express');
const app = express();
const spawn = require("child_process").spawn;

app.listen(3000, () => {
    console.log('server running on port 3000');
} );

app.get('/name', (req, res) => {

    const firstName = req.query['firstname'],
        lastName = req.query['lastname'];

    if (!firstName || !lastName) {
        res.status(401).send('missing-fields')
    }

    const process = spawn('python',["./hello.py", firstName, lastName] );

    let result = '';

    process.stdout.on('data', data => {
        result += data.toString();
    } );

    process.on('close', code => {
        res.send(result);
    })

} );