How to create a two-dimensional array in Python?

In Python, you can create a two-dimensional array using nested lists. Here are some common methods for creating a two-dimensional array.

1. Create a two-dimensional array using list comprehension.

array = [[0 for _ in range(cols)] for _ in range(rows)]

Two loops are used here, the first one is for creating rows and the second one is for creating columns in each row.

1. Create a two-dimensional array by using loops and an empty list.

array = []
for _ in range(rows):
    row = [0] * cols
    array.append(row)

A loop is used here to create the rows, and then within each row, the multiplication operator is used to create the columns.

1. Create a two-dimensional array using the numpy library.

import numpy as np
array = np.zeros((rows, cols))

Here, a two-dimensional array with a specified number of rows and columns is created using the zeros function from the numpy library, with an initial value of 0.

After creating a two-dimensional array using any method, you can access and modify elements in the array by index. For example, to access the element in the ith row and jth column of the two-dimensional array, you can use array[i][j].