從 express 調用 python 腳本

Question

我正在嘗試使用child_process運行 python 腳本，我正在使用打印hello的簡單腳本進行測試，但是我返回的 output 是undefinedhello

腳本.py

#!/usr/bin/python3

print ('hello')

應用程序.js

router.get('/hello', (req, res) => {
    const spawn = require('child_process').spawn;
    const py = spawn('/usr/bin/python3', ['./python/script.py']);
    
    let output;
    py.stdout.on("data", (data) => {
          output += data;
    });
    py.stdout.on("close", () => {
        console.log(output);
        res.sendStatus(200);
    });
});

我嘗試了幾個建議，但沒有一個奏效

Answer 1

const spawn = require('child_process').spawn;     // this should be out of the router

router.get('/hello', (req, res) => {
    
    const py = spawn('/usr/bin/python3', ['./python/script.py']);
    
    let output;
    py.stdout.on("data", (data) => {
          output += data.toString();
    });
    py.on("close", () => {                     // this differs 
        console.log(output);
        res.sendStatus(200);
    });
});

參考child_process