I have a data frame, which I created in pandas, grouping by date and summarizing by rides. 

```
      date   rides
0   2019-01-01  247279
1   2019-01-02  585996
2   2019-01-03  660631
3   2019-01-04  662011
4   2019-01-05  440848
..         ...     ...
451 2020-03-27  218499
452 2020-03-28  143305
453 2020-03-29  110833
454 2020-03-30  207743
455 2020-03-31  199623

[456 rows x 2 columns]

```

My `date` column is in `datetime64[ns]`. 

```
date     datetime64[ns]
rides             int64
dtype: object

```

Now I would like to create another data frame, grouping by month and year (I have data form 2019 and 2020) and summarize by rides. 

Ideal output:

```
Year Month   Rides
2019 January 2000000
2020 March   1000000

```