def user_login(request):
    context = RequestContext(request)
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(username=username, password=password)
        if user:
            if user.is_active:
                login(request, user)#Error in this line
                return HttpResponseRedirect('/')
            else:
                return HttpResponse("Your account is disabled.")
        else:
            print("Invalid login details: {0}, {1}".format(username, password))
            return HttpResponse("Invalid login details supplied.")
    else:
        return render(request, 'Login/login.html', context)

Internal Server Error: /user_login/
    ....
    ....
    File
    "/home/rails/projects/DevProject/DataCraft/DataSearch/views.py",
    line 45, in user_login
    login(request, user)
    TypeError: 'str' object is not callable