How to Copy Lists and Generate a 9×9 Multiplication Table in Python

Example 1

Task: Copy the data from one list to another.

Analysis: Use list slicing (list[:]).

#!/usr/bin/python
# -*- coding: UTF-8 -*-

a = [1, 2, 3]
b = a[:]
print(b)

Output:

[1, 2, 3]

Example 2

Task: Print the 9×9 multiplication table.

Analysis: Use two nested loops, with i controlling rows and j controlling columns.

#!/usr/bin/python
# -*- coding: UTF-8 -*-

for i in range(1, 10):
    for j in range(1, 10):
        result = i * j
        print('%d * %d = % -3d' % (i, j, result))
    print('')

Sample output (partial):

1 * 1 =   1
1 * 2 =   2
1 * 3 =   3
1 * 4 =   4
1 * 5 =   5
1 * 6 =   6
1 * 7 =   7
1 * 8 =   8
1 * 9 =   9

2 * 1 =   2
2 * 2 =   4
2 * 3 =   6
2 * 4 =   8
2 * 5 =  10
2 * 6 =  12
2 * 7 =  14
2 * 8 =  16
2 * 9 =  18

... (continues for rows 3 through 9) ...