docs: def profile(request, username, template="accounts/account_profile.html",
              extra_context=None):
      """
      Display a profile.
      """
      lookup = {"username__iexact": username, "is_active": True}
      context = {"profile_user": get_object_or_404(User, **lookup)}
      context.update(extra_context or {})
      return TemplateResponse(request, template, context)