pandas group by product instead of sum or count

Question

In python pandas, I want to group a dataframe by column and then take the product of the rows for each ID. Sum and count functions exist, but a product?

df2 = pd.DataFrame({'X' : ['B', 'B', 'A', 'A'], 'Y' : [1, 2, 3, 4]})

print(df2.groupby(['X']).sum())
   Y
X   
A  7
B  3

print(df2.groupby(['X']).count())
   Y
X   
A  2
B  2

How can I take the product of the items instead of the sum or count?

print(df2.groupby(['X']).product())
   Y
X   
A  12
B  2

Answer 1

There is prod:

df.groupby('X').prod()