## summarize()


Summarize data records by a grouping key.


Usage

``` python
summarize(
    data,
    group_by="category",
)
```


## Parameters


`data: list[dict]`  
A list of dictionaries to summarize.

`group_by: str = ``"category"`  
The key to group records by.


## Returns


`dict`  
A dictionary mapping group keys to record counts.