def get_template_from_request(request, obj=None, no_current_page=False):
    template = None
    if len(get_cms_setting('TEMPLATES')) == 1:
        return get_cms_setting('TEMPLATES')[0][0]
    if hasattr(request, 'POST') and "template" in request.POST:
        template = request.POST['template']
    elif hasattr(request, 'GET') and "template" in request.GET:
        template = request.GET['template']
    if not template and obj is not None:
        template = obj.get_template()
    if not template and not no_current_page and hasattr(request, "current_page"):
        current_page = request.current_page
        if hasattr(current_page, "get_template"):
            template = current_page.get_template()
    if template is not None and template in dict(get_cms_setting('TEMPLATES')).keys():
        if template == constants.TEMPLATE_INHERITANCE_MAGIC and obj:
            # Happens on admin's request when changing the template for a page
            # to "inherit".
            return obj.get_template()
        return template
    return get_cms_setting('TEMPLATES')[0][0]
Gets a valid template from different sources or falls back to the default
dataset/ETHPy150Open divio/django-cms/cms/utils/__init__.py/get_template_from_request