Sometimes, we want to make a flat list out of a list of lists with Python.
In this article, we’ll look at how to make a flat list out of a list of lists with Python.
How to make a flat list out of a list of lists with Python?
To make a flat list out of a list of lists with Python, we can use the sum function.
For instance, we write:
sublist = [[1, 2, 3], [4, 5, 6], [7], [8, 9]]
flat_list = sum(sublist, [])
print(flat_list)
We call sum with sublist and an empty array to put all the entries of the nested arrays into the empty array and return it.
Therefore flat_list is [1, 2, 3, 4, 5, 6, 7, 8, 9].
Conclusion
To make a flat list out of a list of lists with Python, we can use the sum function.