## transform_source_to_target()


Transform a raw DataFrame into the format defined by a components map.


Usage

``` python
transform_source_to_target(
    df,
    mapping,
)
```


Creates a new DataFrame with columns as defined in `mapping["components"]["TARGET"]` and populates it with data from the source DataFrame based on the column names in `["SOURCE"]`.


## Parameters


`df: pd.DataFrame`  
The input DataFrame with raw data.

`mapping: dict`  
The master mapping dictionary containing a mapping between the input file columns and the columns defined in the schema.


## Returns


`pd.DataFrame`  
The transformed DataFrame with columns as defined in the components

map's TARGET.


## Raises


`KeyError`  
If the mapping does not contain a `"components"` key or its value is empty.