Python code - Vulnerabilities

[helloworld]

Hello

I produced a python code and I already checked and removed all the vulnerabilities. But I need help to disclose any lift vulnerability that I did not see it.

   import base64
   import mimetypes
   import os
   import hashlib
   import hmac
   import requests
   
   from django.core.urlresolvers import reverse
   from django.http import HttpResponse
  from django.shortcuts import redirect, render
  from django.views.decorators.csrf import csrf_exempt
  
  def function(s):
      return s.strip().replace(' ', '').lower()
  
  def form(request):
      env = {'message': request.GET.get('message', 'hello')}
      response = render(request, 'forms/form.html', env)
      response.set_cookie(key='msg_rendered_at', value=time.time())
      return response
  
  def proxy(request):
      url = request.GET.get('url')
      return redirect(url)
  
  def compute_hmac_signature(message, key):
      key = bytes(key, 'UTF-8')
      message = bytes(message, 'UTF-8')
  
      digest = hmac.new(key, message, hashlib.sha1).hexdigest()
      return "sha1={}".format(str(digest))
  
  def user_pic(request):
      """A view that returns the user's avatar image"""
  
      base_path = os.path.join(os.path.dirname(__file__), '../../static/avatars')
      filename = request.GET.get('u')
  
      try:
          data = open(os.path.join(base_path, filename), 'rb').read()
      except IOError:
          return render(request, 'templates/avatar.html')
  
      return HttpResponse(data, content_type=mimetypes.guess_type(filename)[0])
  

[Larz60+]

line 1 - 9 have (i believe unintentional) indent of 1