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Dec 3, 2016 · To make this more readable, you can make a simple function: def flatten_list(deep_list: list[list[object]]): return list(chain.from_iterable(deep_list)). The type hinting improves the clarity of what's going on (modern IDEs would interpret this as returning a list[object] type).
- Example 1: Convert A Nested List Into A Flat List Using Nested For Loops
- Example 2: Using A List Comprehension
- Example 3: Using Recursion
- Example 4: Using The Pandas Module
- Example 6: Using The Python functools Module
- Example 7: Using The Python itertools Module
In this example, we will see that we are Iterating the outer list first and then if there is a sub-list then we are iterating the sub-list using for loop. After that, we are appending the element in our new list “flatList” which gives us a flat list of 1 dimensional. Output: Time Complexity: O(n) Auxiliary Space: O(n)
In this example, we will use list comprehension to Iterate the list first, and then we are iterating the sub-list using for loop. After that, we are appending the element in our new list “flatList” using a List Comprehension which gives us a flat list of 1 dimensional. Output:
In this example, We are using the recursion methodto flat a nested list with multiple levels of nesting.
In this example, we are using a pandas module, pandas have a method called np.concatenatewhich helps us to flat a nested list. Output:
The functools moduleoffers ways to use and extend other functions and callable objects without having to totally rewrite them. Output:
Python’s Itertoolis a module that provides various functions that work on iterators to produce complex iterators. Output:
In this tutorial, you'll learn how to flatten a list of lists in Python. You'll use different tools and techniques to accomplish this task. First, you'll use a loop along with the .extend() method of list. Then you'll explore other tools, including reduce(), sum(), itertools.chain(), and more.
Feb 6, 2024 · In this example, below code starts with a nested list and uses list comprehension to flatten it into a single list. The result, a flattened list, is displayed using `print("Flattened List:", flattened_list)`.
Nov 21, 2013 · So, be it Python 2.7 or 3.3, use list(chain.from_iterable(newlist)) to flatten the nested lists.
Oct 29, 2024 · To flatten a list means to convert a list of nested lists into a single list. For example, [[1, 2], [3, 4]] becomes [1, 2, 3, 4] . Flattening is especially useful when working with complex data structures or lists within dictionaries.
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Sep 17, 2021 · When you convert a list of lists, or a 2-dimensional array, into a one-dimensional array, you are flattening a list of lists. Learn four different ways to do this in this tutorial! Let’s take a look at a simple list of lists in Python, so that you can have a visual depiction of what they actually look like:
