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How to use _format_error method in stestr

Best Python code snippet using stestr_python
validate.py
Source:validate.py
...67        self.schemes = schemes or self.default_schemes68        self.require_tld = require_tld69    def _repr_args(self):70        return 'relative={0!r}'.format(self.relative)71    def _format_error(self, value):72        return self.error.format(input=value)73    def __call__(self, value):74        message = self._format_error(value)75        if not value:76            raise ValidationError(message)77        # Check first if the scheme is valid78        if '://' in value:79            scheme = value.split('://')[0].lower()80            if scheme not in self.schemes:81                raise ValidationError(message)82        regex = self._regex(self.relative, self.require_tld)83        if not regex.search(value):84            raise ValidationError(message)85        return value86class Email(Validator):87    """Validate an email address.88    :param str error: Error message to raise in case of a validation error. Can be89        interpolated with `{input}`.90    """91    USER_REGEX = re.compile(92        r"(^[-!#$%&'*+/=?^`{}|~\w]+(\.[-!#$%&'*+/=?^`{}|~\w]+)*$"  # dot-atom93        # quoted-string94        r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]'95        r'|\\[\001-\011\013\014\016-\177])*"$)', re.IGNORECASE | re.UNICODE)96    DOMAIN_REGEX = re.compile(97        # domain98        r'(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+'99        r'(?:[A-Z]{2,6}|[A-Z0-9-]{2,})$'100        # literal form, ipv4 address (SMTP 4.1.3)101        r'|^\[(25[0-5]|2[0-4]\d|[0-1]?\d?\d)'102        r'(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\]$', re.IGNORECASE | re.UNICODE)103    DOMAIN_WHITELIST = ('localhost',)104    default_message = 'Not a valid email address.'105    def __init__(self, error=None):106        self.error = error or self.default_message107    def _format_error(self, value):108        return self.error.format(input=value)109    def __call__(self, value):110        message = self._format_error(value)111        if not value or '@' not in value:112            raise ValidationError(message)113        user_part, domain_part = value.rsplit('@', 1)114        if not self.USER_REGEX.match(user_part):115            raise ValidationError(message)116        if domain_part not in self.DOMAIN_WHITELIST:117            if not self.DOMAIN_REGEX.match(domain_part):118                try:119                    domain_part = domain_part.encode('idna').decode('ascii')120                except UnicodeError:121                    pass122                else:123                    if self.DOMAIN_REGEX.match(domain_part):124                        return value125                raise ValidationError(message)126        return value127class Range(Validator):128    """Validator which succeeds if the value it is passed is greater129    or equal to ``min`` and less than or equal to ``max``. If ``min``130    is not specified, or is specified as `None`, no lower bound131    exists. If ``max`` is not specified, or is specified as `None`,132    no upper bound exists.133    :param min: The minimum value (lower bound). If not provided, minimum134        value will not be checked.135    :param max: The maximum value (upper bound). If not provided, maximum136        value will not be checked.137    :param str error: Error message to raise in case of a validation error.138        Can be interpolated with `{input}`, `{min}` and `{max}`.139    """140    message_min = 'Must be at least {min}.'141    message_max = 'Must be at most {max}.'142    message_all = 'Must be between {min} and {max}.'143    def __init__(self, min=None, max=None, error=None):144        self.min = min145        self.max = max146        self.error = error147    def _repr_args(self):148        return 'min={0!r}, max={1!r}'.format(self.min, self.max)149    def _format_error(self, value, message):150        return (self.error or message).format(input=value, min=self.min, max=self.max)151    def __call__(self, value):152        if self.min is not None and value < self.min:153            message = self.message_min if self.max is None else self.message_all154            raise ValidationError(self._format_error(value, message))155        if self.max is not None and value > self.max:156            message = self.message_max if self.min is None else self.message_all157            raise ValidationError(self._format_error(value, message))158        return value159class Length(Range):160    """Validator which succeeds if the value passed to it has a161    length between a minimum and maximum. Uses len(), so it162    can work for strings, lists, or anything with length.163    :param int min: The minimum length. If not provided, minimum length164        will not be checked.165    :param int max: The maximum length. If not provided, maximum length166        will not be checked.167    :param int equal: The exact length. If provided, maximum and minimum168        length will not be checked.169    :param str error: Error message to raise in case of a validation error.170        Can be interpolated with `{input}`, `{min}` and `{max}`.171    """172    message_min = 'Shorter than minimum length {min}.'173    message_max = 'Longer than maximum length {max}.'174    message_all = 'Length must be between {min} and {max}.'175    message_equal = 'Length must be {equal}.'176    def __init__(self, min=None, max=None, error=None, equal=None):177        if equal is not None and any([min, max]):178            raise ValueError(179                'The `equal` parameter was provided, maximum or '180                'minimum parameter must not be provided.'181            )182        super(Length, self).__init__(min, max, error)183        self.equal = equal184    def _repr_args(self):185        return 'min={0!r}, max={1!r}, equal={2!r}'.format(self.min, self.max, self.equal)186    def _format_error(self, value, message):187        return (self.error or message).format(input=value, min=self.min, max=self.max,188                                              equal=self.equal)189    def __call__(self, value):190        length = len(value)191        if self.equal is not None:192            if length != self.equal:193                raise ValidationError(self._format_error(value, self.message_equal))194            return value195        if self.min is not None and length < self.min:196            message = self.message_min if self.max is None else self.message_all197            raise ValidationError(self._format_error(value, message))198        if self.max is not None and length > self.max:199            message = self.message_max if self.min is None else self.message_all200            raise ValidationError(self._format_error(value, message))201        return value202class Equal(Validator):203    """Validator which succeeds if the ``value`` passed to it is204    equal to ``comparable``.205    :param comparable: The object to compare to.206    :param str error: Error message to raise in case of a validation error.207        Can be interpolated with `{input}` and `{other}`.208    """209    default_message = 'Must be equal to {other}.'210    def __init__(self, comparable, error=None):211        self.comparable = comparable212        self.error = error or self.default_message213    def _repr_args(self):214        return 'comparable={0!r}'.format(self.comparable)215    def _format_error(self, value):216        return self.error.format(input=value, other=self.comparable)217    def __call__(self, value):218        if value != self.comparable:219            raise ValidationError(self._format_error(value))220        return value221class Regexp(Validator):222    """Validate ``value`` against the provided regex.223    :param regex: The regular expression string to use. Can also be a compiled224        regular expression pattern.225    :param flags: The regexp flags to use, for example re.IGNORECASE. Ignored226        if ``regex`` is not a string.227    :param str error: Error message to raise in case of a validation error.228        Can be interpolated with `{input}` and `{regex}`.229    """230    default_message = 'String does not match expected pattern.'231    def __init__(self, regex, flags=0, error=None):232        self.regex = re.compile(regex, flags) if isinstance(regex, basestring) else regex233        self.error = error or self.default_message234    def _repr_args(self):235        return 'regex={0!r}'.format(self.regex)236    def _format_error(self, value):237        return self.error.format(input=value, regex=self.regex.pattern)238    def __call__(self, value):239        if self.regex.match(value) is None:240            raise ValidationError(self._format_error(value))241        return value242class Predicate(Validator):243    """Call the specified ``method`` of the ``value`` object. The244    validator succeeds if the invoked method returns an object that245    evaluates to True in a Boolean context. Any additional keyword246    argument will be passed to the method.247    :param str method: The name of the method to invoke.248    :param str error: Error message to raise in case of a validation error.249        Can be interpolated with `{input}` and `{method}`.250    :param kwargs: Additional keyword arguments to pass to the method.251    """252    default_message = 'Invalid input.'253    def __init__(self, method, error=None, **kwargs):254        self.method = method255        self.error = error or self.default_message256        self.kwargs = kwargs257    def _repr_args(self):258        return 'method={0!r}, kwargs={1!r}'.format(self.method, self.kwargs)259    def _format_error(self, value):260        return self.error.format(input=value, method=self.method)261    def __call__(self, value):262        method = getattr(value, self.method)263        if not method(**self.kwargs):264            raise ValidationError(self._format_error(value))265        return value266class NoneOf(Validator):267    """Validator which fails if ``value`` is a member of ``iterable``.268    :param iterable iterable: A sequence of invalid values.269    :param str error: Error message to raise in case of a validation error. Can be270        interpolated using `{input}` and `{values}`.271    """272    default_message = 'Invalid input.'273    def __init__(self, iterable, error=None):274        self.iterable = iterable275        self.values_text = ', '.join(text_type(each) for each in self.iterable)276        self.error = error or self.default_message277    def _repr_args(self):278        return 'iterable={0!r}'.format(self.iterable)279    def _format_error(self, value):280        return self.error.format(281            input=value,282            values=self.values_text,283        )284    def __call__(self, value):285        try:286            if value in self.iterable:287                raise ValidationError(self._format_error(value))288        except TypeError:289            pass290        return value291class OneOf(Validator):292    """Validator which succeeds if ``value`` is a member of ``choices``.293    :param iterable choices: A sequence of valid values.294    :param iterable labels: Optional sequence of labels to pair with the choices.295    :param str error: Error message to raise in case of a validation error. Can be296        interpolated with `{input}`, `{choices}` and `{labels}`.297    """298    default_message = 'Not a valid choice.'299    def __init__(self, choices, labels=None, error=None):300        self.choices = choices301        self.choices_text = ', '.join(text_type(choice) for choice in self.choices)302        self.labels = labels if labels is not None else []303        self.labels_text = ', '.join(text_type(label) for label in self.labels)304        self.error = error or self.default_message305    def _repr_args(self):306        return 'choices={0!r}, labels={1!r}'.format(self.choices, self.labels)307    def _format_error(self, value):308        return self.error.format(309            input=value,310            choices=self.choices_text,311            labels=self.labels_text,312        )313    def __call__(self, value):314        try:315            if value not in self.choices:316                raise ValidationError(self._format_error(value))317        except TypeError:318            raise ValidationError(self._format_error(value))319        return value320    def options(self, valuegetter=text_type):321        """Return a generator over the (value, label) pairs, where value322        is a string associated with each choice. This convenience method323        is useful to populate, for instance, a form select field.324        :param valuegetter: Can be a callable or a string. In the former case, it must325            be a one-argument callable which returns the value of a326            choice. In the latter case, the string specifies the name327            of an attribute of the choice objects. Defaults to `str()`328            or `unicode()`.329        """330        valuegetter = valuegetter if callable(valuegetter) else attrgetter(valuegetter)331        pairs = zip_longest(self.choices, self.labels, fillvalue='')332        return ((valuegetter(choice), label) for choice, label in pairs)333class ContainsOnly(OneOf):334    """Validator which succeeds if ``value`` is a sequence and each element335    in the sequence is also in the sequence passed as ``choices``.336    :param iterable choices: Same as :class:`OneOf`.337    :param iterable labels: Same as :class:`OneOf`.338    :param str error: Same as :class:`OneOf`.339    """340    default_message = 'One or more of the choices you made was not acceptable.'341    def _format_error(self, value):342        value_text = ', '.join(text_type(val) for val in value)343        return super(ContainsOnly, self)._format_error(value_text)344    def __call__(self, value):345        choices = list(self.choices)346        if not value and choices:347            raise ValidationError(self._format_error(value))348        # We check list.index instead of using set.issubset so that349        # unhashable types are handled.350        for val in value:351            try:352                index = choices.index(val)353            except ValueError:354                raise ValidationError(self._format_error(value))355            else:356                del choices[index]...
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