Method # 1: Using
itemgetter () + list comprehension +
A combination of the above functions can be used to accomplish this task. In this we access the value using
itemgetter () and the logic for grouping is done using
groupby () and a list comprehension.
The original list: [(1, 4), (2, 4), (6, 7), (5, 1), (6, 1), (8, 1)] The list after grouping by value: [[1, 2], , [5, 6, 8]]
Method # 2: Using
map () + itemgetter () + groupby () + list comprehension
This method is the same as above, with the only difference that we chose a map for generating keys as a nested list for generating new resulting lists.
The original list : [(1, 4), (2, 4), (6, 7), (5, 1), (6, 1), (8, 1)] The list after grouping by value: [[1, 2 ], , [5, 6, 8]]
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