How to Flatten Nested Lists Using List Comprehensions?

Flattening Nested Lists via List Comprehension

When using list comprehensions to transform each element of a list into a list, you may encounter situations where you desire a flattened result instead of a nested list.

For instance, consider a list A and a function f that, when applied to elements in A, return lists. Using a list comprehension, you can obtain a list of lists:

result = [f(a) for a in A]

However, if you seek a flattened list, you can utilize nested iterations within a single list comprehension:

flat_result = [filename for path in dirs for filename in os.listdir(path)]

This comprehension, functionally equivalent to a nested iteration, achieves the desired flattening.

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