build a matrix from the length of tow strings in python

To build a matrix from the length of two strings in Python, you can use a nested loop that iterates over each character in the strings and constructs a row for each of the characters. Here's an example code block:

main.py
str1 = "hello"
str2 = "world"

# Create empty matrix with dimensions equal to the length of the strings
matrix = [[0 for x in range(len(str2))] for y in range(len(str1))]

# Iterate over each character in the strings and construct a row for each of them
for i in range(len(str1)):
    for j in range(len(str2)):
        matrix[i][j] = str1[i] + str2[j]

# Print out the resulting matrix
for row in matrix:
    print(row)
421 chars
15 lines

In this example code block, we create two strings, str1 and str2, and then create an empty matrix using a nested list comprehension. We then iterate over each character in the strings using a double nested loop, and construct a row in the matrix that contains the two characters concatenated together. Finally, we print out the resulting matrix, which contains all possible combinations of characters between the two input strings.