Convert a multidimensional list into a single-dimensional list

Question

How can I use Python to convert a multidimensional list into a single-dimensional list?

I have tried the following solutions, but they have not worked:

Using a for loop to iterate through the list and adding the elements to a new list
Using the flatten method on the list

What I have tried:

# Attempt 1
new_list = []
for element in list:
    new_list.append(element)

# Attempt 2
new_list = list.flatten()

Asked By: DotNetRussell

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Source

Answer 1

You can use numpy to do this:

numpy.array(some_list).ravel()

or:

numpy.array(some_list).flatten()

ravel does not create a new copy and is generally faster.

Answered By: OM222O

Answer 2

To convert a multi-dimensional list into a single-dimensional list, you can use the itertools.chain method from the itertools module in the Python standard library. This method allows you to flatten a multi-dimensional list by "chaining" together the individual sub-lists into a single list.

Here is an example of how to use itertools.chain to flatten a multi-dimensional list:

import itertools

# Original multi-dimensional list
list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

# Flatten the list using itertools.chain
flattened_list = list(itertools.chain(*list))

# Print the flattened list
print(flattened_list)

This code will output the following flattened list: [1, 2, 3, 4, 5, 6, 7, 8, 9].

Answered By: Frowtch

Convert a multidimensional list into a single-dimensional list

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