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How to use _to_function_and_classmethod method in pandera

Best Python code snippet using pandera_python

model_components.py

Source:model_components.py

...300    ) -> None:301        super().__init__(check_fn, **check_kwargs)302        self.fields = fields303        self.regex = regex304def _to_function_and_classmethod(305    fn: Union[AnyCallable, classmethod]306) -> Tuple[AnyCallable, classmethod]:307    if isinstance(fn, classmethod):308        fn, method = fn.__func__, cast(classmethod, fn)309    else:310        method = classmethod(fn)311    return fn, method312ClassCheck = Callable[[Union[classmethod, AnyCallable]], classmethod]313def check(*fields, regex: bool = False, **check_kwargs) -> ClassCheck:314    """Decorator to make SchemaModel method a column/index check function.315    *new in 0.5.0*316    This indicates that the decorated method should be used to validate a field317    (column or index). The method will be converted to a classmethod. Therefore318    its signature must start with `cls` followed by regular check arguments.319    See the :ref:`User Guide <schema_model_custom_check>` for more.320    :param _fn: Method to decorate.321    :param check_kwargs: Keywords arguments forwarded to Check.322    """323    def _wrapper(fn: Union[classmethod, AnyCallable]) -> classmethod:324        check_fn, check_method = _to_function_and_classmethod(fn)325        check_kwargs.setdefault("description", fn.__doc__)326        setattr(327            check_method,328            CHECK_KEY,329            FieldCheckInfo(set(fields), check_fn, regex, **check_kwargs),330        )331        return check_method332    return _wrapper333def dataframe_check(_fn=None, **check_kwargs) -> ClassCheck:334    """Decorator to make SchemaModel method a dataframe-wide check function.335    *new in 0.5.0*336    Decorate a method on the SchemaModel indicating that it should be used to337    validate the DataFrame. The method will be converted to a classmethod.338    Therefore its signature must start with `cls` followed by regular check339    arguments. See the :ref:`User Guide <schema_model_dataframe_check>` for340    more.341    :param check_kwargs: Keywords arguments forwarded to Check.342    """343    def _wrapper(fn: Union[classmethod, AnyCallable]) -> classmethod:344        check_fn, check_method = _to_function_and_classmethod(fn)345        check_kwargs.setdefault("description", fn.__doc__)346        setattr(347            check_method,348            DATAFRAME_CHECK_KEY,349            CheckInfo(check_fn, **check_kwargs),350        )351        return check_method352    if _fn:353        return _wrapper(_fn)  # type: ignore...

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