template_tags.py

@register.assignment_tag
def cache_obj(obj):
    """Cache given obj"""
    if not obj:
        return ""
    return obj

@register.assignment_tag
def get_value_from_dict(obj, key, *args, **kwargs):
    """Get value from target object/dict"""
    try:
        return obj[key]
    except:
        try:
        	return getattr(obj, key)(*args, **kwargs)
        except:
        	pass
    return None