generate random barcode

gen_barcode.py

# pip install "python-barcode[images]"

import random
import barcode
from barcode import generate
from barcode.writer import ImageWriter

def calculate_ean13_checksum(code):
    odd_sum = sum(int(x) for i, x in enumerate(code) if i % 2 == 0)
    even_sum = sum(int(x) for i, x in enumerate(code) if i % 2 == 1)
    total_sum = odd_sum * 3 + even_sum
    return (10 - total_sum % 10) % 10

def generate_ean13(prefix):
    random_digits = [str(random.randint(0, 9)) for _ in range(11 - len(prefix))]
    code_without_checksum = prefix + ''.join(random_digits)
    checksum = calculate_ean13_checksum(code_without_checksum)
    return code_without_checksum + str(checksum)

def generate_upc_from_ean13(ean13_code):
    return ean13_code[1:]

def generate_barcode_image(upc_code, output_file):
    upc_image = generate('UPC', upc_code, output=output_file, writer=ImageWriter(), writer_options={'module_width': 0.4, 'module_height': 20})
    return upc_image

def main():
    ean13_prefix = "515"
    ean13_code = generate_ean13(ean13_prefix)
    upc_code = generate_upc_from_ean13(ean13_code)
    output_file = "upc_barcode.png"

    print("EAN-13 code:", ean13_code)
    print("UPC code:", upc_code)
    generate_barcode_image(upc_code, output_file)
    print(f"Barcode image saved as {output_file}")

if __name__ == "__main__":
    main()