Picture will be reshaped using PIL from PILLOW

picture.py

@login_required(login_url='/login/')
@group_required('client_group')
def picture(request):
    user = request.user
    profile_pictures = django_settings.MEDIA_ROOT + '/profile_pictures/'
    if not os.path.exists(profile_pictures):
        os.makedirs(profile_pictures)
    if request.method == 'POST':
        _picture = request.FILES['picture']
        filename = profile_pictures + request.user.username + '_' + str(request.user.id) + '.jpg'
        with open(filename, 'wb+') as destination:
            for chunk in _picture.chunks():
                destination.write(chunk)
        im = Image.open(filename)
        width, height = im.size
        if width > 400:
            new_width = 400
            new_height = 300       # (height * 400) / width
            new_size = new_width, new_height
            im.thumbnail(new_size, Image.ANTIALIAS)
            im.save(filename)

        user.profile.profile_picture = filename
        user.save()
        return render(request, 'client/client_picture.html')
    return render(request, 'client/client_picture.html')