How to create dependent drop down list

#My form script is

from django import forms
from django.db import models
import os,string
# My production Drive
class my_drive_module(forms.Form):
    drives_a = [chr(x) + ':' for x in range(65, 90) if os.path.exists(chr(x) + ':')]

    #floder
    list_with_tuples = [(x, x) for x in drives_a]
    EMPTY_CHOICES = [('', 'All')] + list_with_tuples

    # Folder List
    #only for ref D:\0pramod\Project 
    os.chdir(r"D:\0pramod\Project")
    my_folder = os.getcwd()
    list_entries = os.listdir(my_folder)
    list_with_folder = [(x, x) for x in list_entries]
    EMPTY_CHOICES_FOLDER = [('', 'All')] + list_with_folder

    #Approve tag CharField
    Production_Drive = forms.CharField(widget=forms.RadioSelect(choices=list_with_tuples))
    pro_folder= forms.CharField(label='Drive folder', widget=forms.Select(choices=EMPTY_CHOICES),required=True)

#My View script is


from django.shortcuts import render
from django.views.generic import TemplateView
from django.http import HttpResponse
from.forms import my_drive_module
from django.contrib import messages
import os
def my_drive_fun(request):

    if request.method =='POST':
        form=my_drive_module(request.POST or None)
        if form.is_valid():
            Production_Drive = form.cleaned_data['Production_Drive']
            work_drive = form.cleaned_data['work_drive']

            #messages.warning(request, 'Please correct the error below.')
            #print(Production_Drive,work_drive,show_name,show_sup,show_coor,pro_folder,work_folder)
    form=my_drive_module()
    drive_data={'form':form}
    return render(request,'my_drive.html',locals())

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