reqparse.py 文件源码

def convert(self, value, op):
        # Don't cast None
        if value is None:
            if self.nullable:
                return None
            else:
                raise ValueError('Must not be null!')

        # and check if we're expecting a filestorage and haven't overridden `type`
        # (required because the below instantiation isn't valid for FileStorage)
        elif isinstance(value, FileStorage) and self.type == FileStorage:
            return value

        try:
            return self.type(value, self.name, op)
        except TypeError:
            try:
                if self.type is decimal.Decimal:
                    return self.type(str(value), self.name)
                else:
                    return self.type(value, self.name)
            except TypeError:
                return self.type(value)