

def write_img(self, img, filename=None):
    if (filename is None):
        suffix = 0
        filepat = 'screen%d.png'
        while os.path.exists((filepat % suffix)):
            suffix = (suffix + 1)
        filename = (filepat % self)
    io.write_png(filename, img)
    print(('Wrote ' + filename))

dataset/ETHPy150Open alexjc/shadertoy-render/shadertoy-render.py RenderingCanvas.write_img/VarMisuse@63/76 `suffix`->`self`