python3.9 pix.set_pixel has something wrong in c.append( ord(i))

[caimaoy]

Description of the bug

python3.9 pix.set_pixel(pos[0], pos[1], (255, 255, 255))
with the error

/lib/python3.9/site-packages/fitz/__init__.py", line 10131, in set_pixel
    c.append( ord(i))

How to reproduce the bug

The code is like this, has some wrong with python3.9, but it works with python3.7

   pdf_file = fitz.open(input_pdf_path)

        for page_no, page in enumerate(pdf_file):
            zoom_x = 4.0
            zoom_y = 4.0
            matrix = fitz.Matrix(zoom_x, zoom_y)
            pix = page.get_pixmap(matrix=matrix)

            for pos in product(range(pix.width), range(pix.height)):
                if sum(pix.pixel(pos[0], pos[1])) >= 600:
                    pix.set_pixel(pos[0], pos[1], (255, 255, 255))

PyMuPDF version

1.23.12

Operating system

MacOS

Python version

3.9

[julian-smith-artifex-com]

Thanks for reporting this.

I have a fix in branch jules-3050. This is in review, and will hopefully be in a new release later today.

[julian-smith-artifex-com]

Fixed in 1.23.15.