validators.py 文件源码

def __call__(self, value):
        value = force_text(value)

        if not value or '@' not in value:
            raise ValidationError(self.message, code=self.code)

        user_part, domain_part = value.rsplit('@', 1)

        if not self.user_regex.match(user_part):
            raise ValidationError(self.message, code=self.code)

        if (domain_part not in self.domain_whitelist and
                not self.validate_domain_part(domain_part)):
            # Try for possible IDN domain-part
            try:
                domain_part = domain_part.encode('idna').decode('ascii')
                if self.validate_domain_part(domain_part):
                    return
            except UnicodeError:
                pass
            raise ValidationError(self.message, code=self.code)