How to Sort Nested Lists or Tuples by a Specific Element's Index?

Sorting Lists or Tuples of Lists or Tuples by an Element at a Specific Index

Consider a list or tuple of lists or tuples with data in a hierarchical structure. For instance:

data = [[1,2,3], [4,5,6], [7,8,9]]
data = [(1,2,3), (4,5,6), (7,8,9)]

To sort this data by the second element of each subset, there are two common approaches: using the sorted() function or the sort() method in ascending order by default.

Using the sorted() function with a key function:

sorted_by_second = sorted(data, key=lambda tup: tup[1])

Using the sort() method with a key function:

data.sort(key=lambda tup: tup[1])  # sorts in place

To sort in descending order, the reverse=True argument can be added:

sorted_by_second = sorted(data, key=lambda tup: tup[1], reverse=True)

data.sort(key=lambda tup: tup[1], reverse=True)  # sorts in place

Regardless of whether lists or tuples are used in the original data structure, the key function effectively accesses the desired element at index 1 and performs the sorting accordingly.

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