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How to use _define_setting method in hypothesis

Best Python code snippet using hypothesis
_settings.py
Source:_settings.py
...216        # @settings was applied, because @given also assigns that attribute.217        test._hypothesis_internal_settings_applied = True218        return test_to_use219    @classmethod220    def _define_setting(221        cls, name, description, default, options=None,222        validator=None, show_default=True, future_default=not_set,223        deprecation_message=None, hide_repr=not_set,224    ):225        """Add a new setting.226        - name is the name of the property that will be used to access the227          setting. This must be a valid python identifier.228        - description will appear in the property's docstring229        - default is the default value. This may be a zero argument230          function in which case it is evaluated and its result is stored231          the first time it is accessed on any given settings object.232        """233        if settings.__definitions_are_locked:234            raise InvalidState(235                'settings have been locked and may no longer be defined.'236            )237        if options is not None:238            options = tuple(options)239            assert default in options240        if future_default is not_set:241            future_default = default242        if hide_repr is not_set:243            hide_repr = bool(deprecation_message)244        all_settings[name] = Setting(245            name, description.strip(), default, options, validator,246            future_default, deprecation_message, hide_repr,247        )248        setattr(settings, name, settingsProperty(name, show_default))249    @classmethod250    def lock_further_definitions(cls):251        settings.__definitions_are_locked = True252    def __setattr__(self, name, value):253        if name in settings._WHITELISTED_REAL_PROPERTIES:254            return object.__setattr__(self, name, value)255        elif name in all_settings:256            if self._construction_complete:257                raise AttributeError(258                    'settings objects are immutable and may not be assigned to'259                    ' after construction.'260                )261            else:262                setting = all_settings[name]263                if (264                    setting.options is not None and265                    value not in setting.options266                ):267                    raise InvalidArgument(268                        'Invalid %s, %r. Valid options: %r' % (269                            name, value, setting.options270                        )271                    )272                return object.__setattr__(self, name, value)273        else:274            raise AttributeError('No such setting %s' % (name,))275    def __repr__(self):276        bits = []277        for name, setting in all_settings.items():278            value = getattr(self, name)279            # The only settings that are not shown are those that are280            # deprecated and left at their default values.281            if value != setting.default or not setting.hide_repr:282                bits.append('%s=%r' % (name, value))283        return 'settings(%s)' % ', '.join(sorted(bits))284    def show_changed(self):285        bits = []286        for name, setting in all_settings.items():287            value = getattr(self, name)288            if value != setting.default:289                bits.append('%s=%r' % (name, value))290        return ', '.join(sorted(bits, key=len))291    def __enter__(self):292        note_deprecation(293            'Settings should be determined only by global state or with the '294            '@settings decorator.'295        )296        default_context_manager = default_variable.with_value(self)297        self.defaults_stack().append(default_context_manager)298        default_context_manager.__enter__()299        return self300    def __exit__(self, *args, **kwargs):301        default_context_manager = self.defaults_stack().pop()302        return default_context_manager.__exit__(*args, **kwargs)303    @staticmethod304    def register_profile(name, parent=None, **kwargs):305        # type: (str, settings, **Any) -> None306        """Registers a collection of values to be used as a settings profile.307        Settings profiles can be loaded by name - for example, you might308        create a 'fast' profile which runs fewer examples, keep the 'default'309        profile, and create a 'ci' profile that increases the number of310        examples and uses a different database to store failures.311        The arguments to this method are exactly as for312        :class:`~hypothesis.settings`: optional ``parent`` settings, and313        keyword arguments for each setting that will be set differently to314        parent (or settings.default, if parent is None).315        """316        if not isinstance(name, (str, text_type)):317            note_deprecation('name=%r must be a string' % (name,))318        if 'settings' in kwargs:319            if parent is None:320                parent = kwargs.pop('settings')321                note_deprecation('The `settings` argument is deprecated - '322                                 'use `parent` instead.')323            else:324                raise InvalidArgument(325                    'The `settings` argument is deprecated, and has been '326                    'replaced by the `parent` argument.  Use `parent` only.'327                )328        settings._profiles[name] = settings(parent=parent, **kwargs)329    @staticmethod330    def get_profile(name):331        # type: (str) -> settings332        """Return the profile with the given name."""333        if not isinstance(name, (str, text_type)):334            note_deprecation('name=%r must be a string' % (name,))335        try:336            return settings._profiles[name]337        except KeyError:338            raise InvalidArgument('Profile %r is not registered' % (name,))339    @staticmethod340    def load_profile(name):341        # type: (str) -> None342        """Loads in the settings defined in the profile provided.343        If the profile does not exist, InvalidArgument will be raised.344        Any setting not defined in the profile will be the library345        defined default for that setting.346        """347        if not isinstance(name, (str, text_type)):348            note_deprecation('name=%r must be a string' % (name,))349        settings._current_profile = name350        settings._assign_default_internal(settings.get_profile(name))351@contextlib.contextmanager352def local_settings(s):353    default_context_manager = default_variable.with_value(s)354    with default_context_manager:355        yield s356@attr.s()357class Setting(object):358    name = attr.ib()359    description = attr.ib()360    default = attr.ib()361    options = attr.ib()362    validator = attr.ib()363    future_default = attr.ib()364    deprecation_message = attr.ib()365    hide_repr = attr.ib()366settings._define_setting(367    'min_satisfying_examples',368    default=not_set,369    description="""370This doesn't actually do anything, but remains for compatibility reasons.371""",372    deprecation_message="""373The min_satisfying_examples setting has been deprecated and disabled, due to374overlap with the filter_too_much healthcheck and poor interaction with the375max_examples setting.376"""377)378settings._define_setting(379    'max_examples',380    default=100,381    description="""382Once this many satisfying examples have been considered without finding any383counter-example, falsification will terminate.384"""385)386settings._define_setting(387    'max_iterations',388    default=not_set,389    description="""390This doesn't actually do anything, but remains for compatibility reasons.391""",392    deprecation_message="""393The max_iterations setting has been disabled, as internal heuristics are more394useful for this purpose than a user setting.  It no longer has any effect.395"""396)397settings._define_setting(398    'buffer_size',399    default=8 * 1024,400    description="""401The size of the underlying data used to generate examples. If you need to402generate really large examples you may want to increase this, but it will make403your tests slower.404"""405)406settings._define_setting(407    'max_shrinks',408    default=not_set,409    description="""410Passing ``max_shrinks=0`` disables the shrinking phase (see the ``phases``411setting), but any other value has no effect and uses a general heuristic.412""",413    deprecation_message="""414The max_shrinks setting has been disabled, as internal heuristics are more415useful for this purpose than a user setting.416"""417)418def _validate_timeout(n):419    if n is unlimited:420        return -1421    else:422        return n423settings._define_setting(424    'timeout',425    default=60,426    description="""427Once this many seconds have passed, falsify will terminate even428if it has not found many examples. This is a soft rather than a hard429limit - Hypothesis won't e.g. interrupt execution of the called430function to stop it. If this value is <= 0 then no timeout will be431applied.432""",433    hide_repr=False,  # Still affects behaviour at runtime434    deprecation_message="""435The timeout setting is deprecated and will be removed in a future version of436Hypothesis. To get the future behaviour set ``timeout=hypothesis.unlimited``437instead (which will remain valid for a further deprecation period after this438setting has gone away).439""",440    future_default=unlimited,441    validator=_validate_timeout442)443settings._define_setting(444    'derandomize',445    default=False,446    description="""447If this is True then hypothesis will run in deterministic mode448where each falsification uses a random number generator that is seeded449based on the hypothesis to falsify, which will be consistent across450multiple runs. This has the advantage that it will eliminate any451randomness from your tests, which may be preferable for some situations.452It does have the disadvantage of making your tests less likely to453find novel breakages.454"""455)456settings._define_setting(457    'strict',458    default=os.getenv('HYPOTHESIS_STRICT_MODE') == 'true',459    description="""460Strict mode has been deprecated in favor of Python's standard warnings461controls.  Ironically, enabling it is therefore an error - it only exists so462that users get the right *type* of error!463""",464    deprecation_message="""465Strict mode is deprecated and will go away in a future version of Hypothesis.466To get the same behaviour, use467warnings.simplefilter('error', HypothesisDeprecationWarning).468""",469    future_default=False,470)471def _validate_database(db, _from_db_file=False):472    from hypothesis.database import ExampleDatabase473    if db is None or isinstance(db, ExampleDatabase):474        return db475    if _from_db_file or db is not_set:476        return ExampleDatabase(db)477    raise InvalidArgument(478        'Arguments to the database setting must be None or an instance of '479        'ExampleDatabase.  Try passing database=ExampleDatabase(%r), or '480        'construct and use one of the specific subclasses in '481        'hypothesis.database' % (db,)482    )483settings._define_setting(484    'database',485    default=not_set,486    show_default=False,487    description="""488An instance of hypothesis.database.ExampleDatabase that will be489used to save examples to and load previous examples from. May be None490in which case no storage will be used, `:memory:` for an in-memory491database, or any path for a directory-based example database.492""",493    validator=_validate_database,494)495settings._define_setting(496    'database_file',497    default=not_set,498    show_default=False,499    description="""500The file or directory location to save and load previously tried examples;501`:memory:` for an in-memory cache or None to disable caching entirely.502""",503    validator=lambda f: _validate_database(f, _from_db_file=True),504    deprecation_message="""505The `database_file` setting is deprecated in favor of the `database`506setting, and will be removed in a future version.  It only exists at507all for complicated historical reasons and you should just use508`database` instead.509""",510)511@unique512class Phase(IntEnum):513    explicit = 0514    reuse = 1515    generate = 2516    shrink = 3517@unique518class HealthCheck(Enum):519    """Arguments for :attr:`~hypothesis.settings.suppress_health_check`.520    Each member of this enum is a type of health check to suppress.521    """522    def __repr__(self):523        return '%s.%s' % (self.__class__.__name__, self.name)524    @classmethod525    def all(cls):526        # type: () -> List[HealthCheck]527        bad = (HealthCheck.exception_in_generation, HealthCheck.random_module)528        return [h for h in list(cls) if h not in bad]529    exception_in_generation = 0530    """Deprecated and no longer does anything. It used to convert errors in531    data generation into FailedHealthCheck error."""532    data_too_large = 1533    """Check for when the typical size of the examples you are generating534    exceeds the maximum allowed size too often."""535    filter_too_much = 2536    """Check for when the test is filtering out too many examples, either537    through use of :func:`~hypothesis.assume()` or :ref:`filter() <filtering>`,538    or occasionally for Hypothesis internal reasons."""539    too_slow = 3540    """Check for when your data generation is extremely slow and likely to hurt541    testing."""542    random_module = 4543    """Deprecated and no longer does anything. It used to check for whether544    your tests used the global random module. Now @given tests automatically545    seed random so this is no longer an error."""546    return_value = 5547    """Checks if your tests return a non-None value (which will be ignored and548    is unlikely to do what you want)."""549    hung_test = 6550    """Checks if your tests have been running for a very long time."""551    large_base_example = 7552    """Checks if the natural example to shrink towards is very large."""553    not_a_test_method = 8554    """Checks if @given has been applied to a method of unittest.TestCase."""555@unique556class Statistics(IntEnum):557    never = 0558    interesting = 1559    always = 2560@unique561class Verbosity(IntEnum):562    quiet = 0563    normal = 1564    verbose = 2565    debug = 3566    @staticmethod567    def _get_default():568        # type: () -> Verbosity569        var = os.getenv('HYPOTHESIS_VERBOSITY_LEVEL')570        if var is not None:  # pragma: no cover571            try:572                result = Verbosity[var]573            except KeyError:574                raise InvalidArgument('No such verbosity level %r' % (var,))575            warnings.warn(HypothesisDeprecationWarning(576                'The HYPOTHESIS_VERBOSITY_LEVEL environment variable is '577                'deprecated, and will be ignored by a future version of '578                'Hypothesis.  Configure your verbosity level via a '579                'settings profile instead.'580            ))581            return result582        return Verbosity.normal583    def __repr__(self):584        return 'Verbosity.%s' % (self.name,)585settings._define_setting(586    'verbosity',587    options=tuple(Verbosity),588    default=Verbosity._get_default(),589    description='Control the verbosity level of Hypothesis messages',590)591def _validate_phases(phases):592    if phases is None:593        return tuple(Phase)594    phases = tuple(phases)595    for a in phases:596        if not isinstance(a, Phase):597            raise InvalidArgument('%r is not a valid phase' % (a,))598    return phases599settings._define_setting(600    'phases',601    default=tuple(Phase),602    description=(603        'Control which phases should be run. ' +604        'See :ref:`the full documentation for more details <phases>`'605    ),606    validator=_validate_phases,607)608settings._define_setting(609    name='stateful_step_count',610    default=50,611    description="""612Number of steps to run a stateful program for before giving up on it breaking.613"""614)615settings._define_setting(616    'perform_health_check',617    default=not_set,618    description=u"""619If set to True, Hypothesis will run a preliminary health check before620attempting to actually execute your test.621""",622    deprecation_message="""623This setting is deprecated, as `perform_health_check=False` duplicates the624effect of `suppress_health_check=HealthCheck.all()`.  Use that instead!625""",626)627def validate_health_check_suppressions(suppressions):628    suppressions = try_convert(list, suppressions, 'suppress_health_check')629    for s in suppressions:630        if not isinstance(s, HealthCheck):631            note_deprecation((632                'Non-HealthCheck value %r of type %s in suppress_health_check '633                'will be ignored, and will become an error in a future '634                'version of Hypothesis') % (635                s, type(s).__name__,636            ))637        elif s in (638            HealthCheck.exception_in_generation, HealthCheck.random_module639        ):640            note_deprecation((641                '%s is now ignored and suppressing it is a no-op. This will '642                'become an error in a future version of Hypothesis. Simply '643                'remove it from your list of suppressions to get the same '644                'effect.') % (s,))645    return suppressions646settings._define_setting(647    'suppress_health_check',648    default=(),649    description="""A list of health checks to disable.""",650    validator=validate_health_check_suppressions651)652settings._define_setting(653    'deadline',654    default=not_set,655    description=u"""656If set, a time in milliseconds (which may be a float to express657smaller units of time) that each individual example (i.e. each time your test658function is called, not the whole decorated test) within a test is not659allowed to exceed. Tests which take longer than that may be converted into660errors (but will not necessarily be if close to the deadline, to allow some661variability in test run time).662Set this to None to disable this behaviour entirely.663In future this will default to 200. For now, a664HypothesisDeprecationWarning will be emitted if you exceed that default665deadline and have not explicitly set a deadline yourself.666"""667)668settings._define_setting(669    'use_coverage',670    default=not_set,671    deprecation_message="""672use_coverage no longer does anything and can be removed from your settings.673""",674    description="""675A flag to enable a feature that no longer exists. This setting is present676only for backwards compatibility purposes.677"""678)679class PrintSettings(Enum):680    """Flags to determine whether or not to print a detailed example blob to681    use with :func:`~hypothesis.reproduce_failure` for failing test cases."""682    NEVER = 0683    """Never print a blob."""684    INFER = 1685    """Make an educated guess as to whether it would be appropriate to print686    the blob.687    The current rules are that this will print if:688    1. The output from Hypothesis appears to be unsuitable for use with689       :func:`~hypothesis.example`, and690    2. The output is not too long, and691    3. Verbosity is at least normal."""692    ALWAYS = 2693    """Always print a blob on failure."""694settings._define_setting(695    'print_blob',696    default=PrintSettings.INFER,697    description="""698Determines whether to print blobs after tests that can be used to reproduce699failures.700See :ref:`the documentation on @reproduce_failure <reproduce_failure>` for701more details of this behaviour.702"""703)704settings.lock_further_definitions()705def note_deprecation(message, s=None):706    # type: (str, settings) -> None707    if s is None:708        s = settings.default...
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