make a virtual enviornment with all existing librariers code example

Example 1: python virtualenv venv

python -m venv venv

Example 2: .env tutorial

const express = require('express');const app = express();const port = process.env.PORT || 3000;require('dotenv').config();app.get('/', (req, res) => {    res.send(process.env.SECRET_KEY);})app.listen(port, () => {    console.log(`Server is running on port ${port}.`)})

Example 3: virtual environment python

source env/bin/activate