main.py

# --------------------------------------------------
# ! DOSEN'T WORK WITH PYPY, ONLY WORKS WITH CPYTHON
# due to some issues with printing unicode chars
# --------------------------------------------------


import qrcode
import numpy as np
import sys


# generate qr code as binary matrix
qr = qrcode.QRCode(
    version=None,
    error_correction=qrcode.constants.ERROR_CORRECT_M,
    box_size=1,
    border=4,
)
qr.add_data(sys.argv[1])
qr.make(fit=True)
qr = qr.make_image(fill_color="black", back_color="white")
qr = np.array(qr)


# if height of qr code is odd, append one row of zeros
# since each block character is 2x1 (height x width)
if (qr.shape[0]%2 == 1):
    qr = np.vstack((qr, np.zeros((1, qr.shape[1]), dtype=bool)))


# print the qr code using block unicode chars ('▄','█','▀',' ')
for i in range(0, qr.shape[0], 2):

    for j in range(qr.shape[1]):

        if qr[i,j] == True and qr[i+1,j] == True:
            print("█", end="")

        elif qr[i,j] == True and qr[i+1,j] == False:
            print("▀", end="")

        elif qr[i,j] == False and qr[i+1,j] == True:
            print("▄", end="")

        else:
            print(" ", end="")

    print("\n", end="")