What does the following code output? from itertools import groupby data = [(‘a’, 1), (‘a’, 2), (‘b’, 3), (‘a’, 4)] for key, group in groupby(data, key=lambda x: x[0]): print(key, list(group))

Question

Python Professional — Hard

What does the following code output? from itertools import groupby data = [(‘a’, 1), (‘a’, 2), (‘b’, 3), (‘a’, 4)] for key, group in groupby(data, key=lambda x: x[0]): print(key, list(group))

Accepted Answer

The code uses itertools groupby to group elements in the list 'data' by the first element of each tuple. It outputs the groups with their corresponding keys. In this case, it groups ('a',1) and ('a',2) together, then ('b',3) separately, and finally ('a',4) alone.