Python How to check if a nested list is essentially empty
на канале: CodeFix
In Python, you may encounter situations where you need to determine if a nested list is essentially empty, meaning it contains no elements or consists only of empty sublists. In this tutorial, we will explore different methods to accomplish this task, along with code examples.
Before we proceed, let's clarify what a nested list is. A nested list is a list that contains other lists as its elements. These sublists can also have sublists, creating a hierarchical structure. To check if a nested list is essentially empty, we need to account for all levels of nesting.
One approach to check if a nested list is essentially empty is by using recursion. We can create a function that traverses the nested list recursively and checks for empty elements at each level. Here's the code for this method:
This recursive function checks if the list is empty or if all its elements are essentially empty by recursively calling itself on each element.
Another method to check if a nested list is essentially empty is by using a depth-first search (DFS) approach. We'll flatten the nested list using DFS and check if the resulting flattened list is empty. Here's the code for this method:
In this approach, we define a generator function to flatten the nested list, and then we check if the flattened list is empty.
Starting from Python 3.8, you can use recursive lambda functions to check if a nested list is essentially empty. Here's how you can do it:
In this method, we use a lambda function with the map and all functions to recursively check the nested list.
You've learned three different methods to check if a nested list is essentially empty in Python. Choose the method that best suits your needs and the version of Python you are using. Whether you prefer recursion, a depth-first search, or a lambda function, these methods will help you handle nested lists effectively.
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