Terminal effect in the matrix movie

matrixeffect.py

#!/usr/bin/env python3
#-*- encoding:utf-8 -*-

from os import system, popen
from time import sleep
from random import choice, randint
from string import ascii_letters

BLANK = ' '
TIME = 0.09 # TIME must be lower than 0.1 for a cool effect


def getTerminalSize():
    l,c = popen('stty size', 'r').read().split()
    c = int(c) // 2
    return int(l), c


def getRandomChar():
    char = choice(ascii_letters)
    return char


def randomizeRow(c):
    colist = []
    for i in range(c):
        value = getRandomChar()
        if ord(value) % randint(2, 3) == 0:
            colist.append(BLANK)
        else:
            colist.append(value)
    return colist


def generateMatrix(rows, columns):
    rowsList = []
    for i in range(rows):
        columnsList = []
        for j in range(columns):
            columnsList.append(BLANK)
        rowsList.append(columnsList)
    return rowsList


def editMatrix(matrix, index, c):
    if index+1 < len(matrix):
        editMatrix(matrix, index+1, c)

    if index == 0:
        matrix[index] = randomizeRow(c)
    else:
        matrix[index] = matrix[index-1]


def showMatrix(matrix):
    for i in range(len(matrix)):
        print(BLANK.join(matrix[i]))


def main(l, c):
    matrix = generateMatrix(l,c)
    print('\033[92m')
    try:
        while(True):
           showMatrix(matrix)
           editMatrix(matrix, 0, c)
           sleep(TIME)
           system('clear')
    except (KeyboardInterrupt):
        system('clear')
        print('\033[0m')

if __name__ == '__main__':
    l, c = getTerminalSize()
    main(l, c)