Beautifulsoup and JavaScript Values

[Reldaing]

Here it is:

import requests
import urllib.request
import time
from bs4 import BeautifulSoup
import os

if __name__ == '__main__':
    def dossier():
        os.chdir("C://Users//Ridha//Desktop//Web-Scrapper")

    dossier()
moit="https://www.lelscan-vf.com/manga/"
url="https://www.lelscan-vf.com/manga/vinland-saga/164"


def Navigate(url):
    response = requests.get(url)
    soup = BeautifulSoup(response.text, "html.parser")
    L= Img(soup)
    return soup

def Img(soup):
    L = []
    images = soup.findAll('img')
    for lien in images:
        if 'class' in lien.attrs:
            if lien['class']==['img-responsive']:
                a= lien['data-src']
                L.append(a)
    return L
def Next(soup):

    a= soup.find('var next_chapter')
    NextUrl = a['var next_chapter']
     if NextUrl==""
    NextUrl="End"
    else:
    NextUrl=a['var next_chapter']
   
   
    return NextUrl

If you want to try the code , just type in the console Navigate("https://www.lelscan-vf.com/manga/vinland-saga/164"
)
It ll give you the soup. And in the soup is the variable. I would like to get it and return it. Thanks for helping mate