validators.py 文件源码

def is_valid(self, value, params):
        if isinstance(value, basestring):
            self.message = _('The {{key}} must be between {min} and {max} characters.').format(
                min=self.min_value,
                max=self.max_value
            )
            return self.min_value <= len(value) <= self.max_value
        elif isinstance(value, File):
            self.message = _('The {{key}} must be between {min} and {max} bytes.').format(
                min=self.min_value,
                max=self.max_value
            )
            return self.min_value <= value.size <= self.max_value
        else:
            self.message = _('The {{key}} must be between {min} and {max}.').format(
                min=self.min_value,
                max=self.max_value
            )
            return self.min_value <= value <= self.max_value