## filter_rows()


Filter out rows where values are not in the allowed codelist.


Usage

``` python
filter_rows(
    df,
    codelist_ids,
)
```


Compares as strings but does not change DataFrame dtypes. Does not mutate the input DataFrame.


## Parameters


`df: pd.DataFrame`  
The input DataFrame.

`codelist_ids: dict[str, list[str]]`  
A mapping of column names to allowed codelist IDs.


## Returns


`pd.DataFrame`  
A filtered copy of the DataFrame containing only selected rows.