Attempt to cast *value* into *type_func*, returning *default* if it fails.

def _parse_type(value, type_func):
        """
        Attempt to cast *value* into *type_func*, returning *default* if it fails.
        """
        default = type_func(0)
        if value is None:
            return default
        try:
            return type_func(value)
        except ValueError:
            return default