Convert 2d list to 1d python This results in a single list with all the elements from the 2D list. Oct 29, 2022 · In Python, the extend() method can be used to flatten a nested list into a 1D list efficiently. You access the list items by referring to the index number. Flatten a NumPy array with ravel () and flatten () If you need to convert a one-dimensional ndarray or list to two dimensions, refer to the following article. Luckily, there are many ways to do this in Python. I have a list looks like this: [ [1,2,3], [1,2], [1,4,5,6,7]] and I want to flatten it into [1,2,3,1,2,1,4,5,6,7] is there a light weight function to do this without using numpy? Jul 11, 2025 · A nested loop iterates over each sublist in the 2D list and then over each element in the sublist appending each element to a new flattened list. Using append and index In this approach we will create a for loop to loop through each Sep 25, 2012 · I want to convert a 1-dimensional array into a 2-dimensional array by specifying the number of columns in the 2D array. Want to learn how to convert 2d Array into 1d Array using Python? Then, stay tuned to this tutorial and jump into the main heads via the available links shown below: Convert 2D Jun 15, 2020 · how to convert two dimension array to one dimension in python? [duplicate] Asked 5 years, 4 months ago Modified 5 years, 4 months ago Viewed 4k times. It can be converted in one line by using the sum function. But in a 2D list we have list nested inside the outer list. 03woms hb3jj qp rarfxk ppczko 1gk bbn7hem mtj 0jet ub