Define a function called filter$\_$by$\_$year that takes a dataset such as baseball$\_$data and a year as input and outputs subsets of each table in the dataset that include only data from that year. Then, filter baseball$\_$data to include only data from $1987,$ print the first two rows of each dataframe within the filtered dataset, and examine the data.

Please do not modify or write any code above the preset code:

def filter$\_$by$\_$year$($baseball$\_$data, year$)$:

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filtered$\_$data $=$ filter$\_$by$\_$year$($baseball$\_$data, $1987)$

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