Web Reference: It will return a filter object in python3 and a list in python2 (see this question found at the same time). This is a slight difference but it must be take in account when developing compatible scripts. Oct 28, 2025 · Explanation: lambda b: b returns True for non-empty sublists and False for empty ones. filter () keeps only sublists where the lambda returns True. list () converts the filtered result back to a list. Using NumPy For lists containing numeric data, NumPy can efficiently remove empty sublists. Dec 12, 2025 · How to Remove All Empty Lists from a List (Including Nested) in Python Working with nested lists is a common task in Python, whether you’re processing data, parsing JSON, or handling complex data structures. However, nested lists often contain empty sublists ([]) that can clutter your data and interfere with further processing.
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