How to Transpose list of lists in Python

To transpose a list of lists (i.e., a matrix) in Python, you can use the zip() function along with the * (asterisk) operator for unpacking, followed by a list comprehension to convert the zipped tuples to lists.

Here's an example:

matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

# Transpose the matrix using zip and list comprehension
transposed = [list(row) for row in zip(*matrix)]
print(transposed)

This will output:

[[1, 4, 7], [2, 5, 8], [3, 6, 9]]

In this example, the * operator is used to unpack the list of lists (matrix) before passing it to the zip() function. The zip() function then zips together the corresponding elements from each of the inner lists, effectively transposing the matrix. Finally, a list comprehension is used to convert the zipped tuples to lists.

Python transpose 2D list:

Description: Transposing a 2D list in Python.

Code:

original_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
transposed_list = [list(row) for row in zip(*original_list)]
print("Transposed 2D List:", transposed_list)

How to switch rows and columns in a list of lists in Python:

Description: Switching rows and columns in a list of lists.

Code:

list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
switched_list = [list(row) for row in zip(*list_of_lists)]
print("Switched Rows and Columns in List of Lists:", switched_list)

Transpose a matrix in Python:

Description: Transposing a matrix (list of lists) in Python.

Code:

matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
transposed_matrix = [list(row) for row in zip(*matrix)]
print("Transposed Matrix:", transposed_matrix)

Example code for transposing a list of lists:

Description: Providing a basic example of transposing a list of lists in Python.

Code:

list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
transposed_list = [list(row) for row in zip(*list_of_lists)]
print("Transposed List of Lists:", transposed_list)

Using zip to transpose a list of lists in Python:

Description: Using the zip function to transpose a list of lists.

Code:

list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
transposed_list = list(map(list, zip(*list_of_lists)))
print("Transposed List of Lists using zip:", transposed_list)

Transpose list of lists using numpy in Python:

Description: Transposing a list of lists using NumPy in Python.

Code:

import numpy as np

list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
transposed_list = np.transpose(list_of_lists)
print("Transposed List of Lists using NumPy:", transposed_list)

Transpose jagged list of lists in Python:

Description: Transposing a jagged list of lists (lists with varying lengths).

Code:

jagged_list = [[1, 2], [3, 4, 5], [6, 7, 8, 9]]
transposed_jagged_list = [list(row) for row in zip(*jagged_list)]
print("Transposed Jagged List of Lists:", transposed_jagged_list)

Python list comprehension for transposing a list of lists:

Description: Using list comprehension to transpose a list of lists in Python.

Code:

list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
transposed_list = [list(row) for row in zip(*list_of_lists)]
print("Transposed List of Lists using List Comprehension:", transposed_list)

Transpose list of lists without using zip in Python:

Description: Transposing a list of lists without using the zip function.

Code:

list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
transposed_list = [[row[i] for row in list_of_lists] for i in range(len(list_of_lists[0]))]
print("Transposed List of Lists without using zip:", transposed_list)