How to use _to_function_and_classmethod method in pandera

Best Python code snippet using pandera_python

model_components.py

Source:model_components.py Github

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...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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