square_wave_visual.py

#!/usr/bin/env python3

def print_square_wave(character, length, period):
    for i in range(0, period):
        for _ in range(0, length - 1):
            print(character)

        for _ in range(0, length):
            print(character + " ", end="")

        print()

        for _ in range(0, length - 1):
            for i in range(0, length):
                if i == length - 1:
                    print(character)
                else:
                    print("  ", end="")

        for _ in range(0, length):
            print(character + " ", end="")

        print()

print_square_wave("k", 4, 3)