Python 图片合并pdf

from PIL import Imageimport osimport img2pdf flag = Falsewhile not flag:    dirname = input("请输入图片文件夹所在路径(例如d:/wlzcool)：")    flag = os.path.exists(dirname)    if not flag:        print("图片文件夹所在路径不存在！")saveflag = Falsewhile not saveflag:    savedirname = input("请输入目标图片文件夹所在路径(例如d:/wlzcool2)：")    saveflag = os.path.exists(savedirname)    if not saveflag:        print("图片文件夹所在路径不存在！")        automakedir = input("是否自动创建对应文件夹？(是Y/否N):")        if automakedir.strip().upper() == "Y":            os.makedirs(savedirname)            saveflag = Truefiles = os.listdir(dirname)reductionFactor = int(input("请输入长宽压缩比(例如3):"))if reductionFactor <= 0:    reductionFactor = 3isConvertBlack = input("是否输出黑白版本？(是Y/否N):").strip().upper() == "Y"for fname in files:    if not fname.endswith(".jpg"):        continue    path = os.path.join(dirname, fname)    savePath = os.path.join(savedirname, fname)    if os.path.isdir(path):        continue    img = Image.open(path)        if img.size[0] > img.size[1]:        im_rotate = img.rotate(90, expand=True)        size = (int(im_rotate.size[0] / reductionFactor), int(im_rotate.size[1] / reductionFactor))        im_rotate = im_rotate.resize(size)        if isConvertBlack:            im_rotate = im_rotate.convert("L")        im_rotate.save(savePath, quality=95)    else:        size = (int(img.size[0] / reductionFactor), int(img.size[1] / reductionFactor))        img = img.resize(size)        if isConvertBlack:            img = img.convert("L")        img.save(savePath, quality=95)filename = input("请输入输出文件名(例如：第一章)：")with open(filename + ".pdf", "wb") as f:    imgs = []    files = os.listdir(savedirname)    for fname in files:        if not fname.endswith(".jpg"):            continue        path = os.path.join(savedirname, fname)        if os.path.isdir(path):            continue        imgs.append(path)    f.write(img2pdf.convert(imgs))