How to use fn_assign_copy method in pandera

Best Python code snippet using pandera_python

pandas_dataframe.py

Source:pandas_dataframe.py

...20def fn_pipe_incorrect_type(df: DataFrame[Schema]) -> DataFrame[SchemaOut]:21    return df.assign(age=30).pipe(DataFrame[AnotherSchema])  # mypy error22    # error: Argument 1 to "pipe" of "NDFrame" has incompatible type "Type[DataFrame[Any]]";  # noqa23    # expected "Union[Callable[..., DataFrame[SchemaOut]], Tuple[Callable[..., DataFrame[SchemaOut]], str]]"  [arg-type]  # noqa24def fn_assign_copy(df: DataFrame[Schema]) -> DataFrame[SchemaOut]:25    return df.assign(age=30)  # mypy error26    # error: Incompatible return value type (got "pandas.core.frame.DataFrame",27    # expected "pandera.typing.pandas.DataFrame[SchemaOut]")  [return-value]28# Define a few dataframe objects29schema_df = DataFrame[Schema]({"id": [1], "name": ["foo"]})30pandas_df = pd.DataFrame({"id": [1], "name": ["foo"]})31another_df = DataFrame[AnotherSchema]({"id": [1], "first_name": ["foo"]})32fn(schema_df)  # mypy okay33fn(pandas_df)  # mypy error34# error: Argument 1 to "fn" has incompatible type "pandas.core.frame.DataFrame";  # noqa35# expected "pandera.typing.pandas.DataFrame[Schema]"  [arg-type]36fn(another_df)  # mypy error37# error: Argument 1 to "fn" has incompatible type "DataFrame[AnotherSchema]";38# expected "DataFrame[Schema]"  [arg-type]...

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