how does numpy transpose work code example

Example 1: transpose matrices numpy

import numpy as np

A = [1, 2, 3, 4]
np.array(A).T # .T is used to transpose matrix

Example 2: transpose matrix in python without numpy

def transpose(matrix):
    rows = len(matrix)
    columns = len(matrix[0])

    matrix_T = []
    for j in range(columns):
        row = []
        for i in range(rows):
           row.append(matrix[i][j])
        matrix_T.append(row)

    return matrix_T