我怎样才能省钱 img 到特定文件夹？我试过了 img.save(path, format="PNG") 但它不起作用。

def generate_qr_code(url):
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_L,
        box_size=15,
        border=5,
    )
    qr.add_data(url)
    path = ('./static/image')
    qr.make(fit=True)
    img = qr.make_image(fill='black', back_color='white')
    temp = BytesIO()
    img.save(path, format="PNG")
    qr_img = base64.b64encode(temp.getvalue())
    return qr_img