validators.py 文件源码

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