Python使用到第三方库PyMuPDF图片与pdf相互转换

import fitzimport globdef rightinput(desc):  flag=True  while(flag):    instr = input(desc)    try:      intnum = eval(instr)      if type(intnum)==int:        flag = False    except:      print('请输入正整数！')      pass  return intnumpdffile = glob.glob("*.pdf")[0]doc = fitz.open(pdffile)flag = rightinput("输入：1：全部页面；2：选择页面/t")if flag == 1:  strat = 0  totaling = doc.pageCountelse:  strat = rightinput('输入起始页面：') - 1  totaling = rightinput('输入结束页面：')for pg in range(strat, totaling):  page = doc[pg]  zoom = int(100)  rotate = int(0)  trans = fitz.Matrix(zoom / 100.0, zoom / 100.0).preRotate(rotate)  pm = page.getPixmap(matrix=trans, alpha=False)  pm.writePNG('pdf2png/%s.png' % str(pg+1))

import globimport fitzimport osdef pic2pdf():  doc = fitz.open()  for img in sorted(glob.glob("pic2pdf/*")): # 读取图片，确保按文件名排序    print(img)    imgdoc = fitz.open(img)         # 打开图片    pdfbytes = imgdoc.convertToPDF()    # 使用图片创建单页的 PDF    imgpdf = fitz.open("pdf", pdfbytes)    doc.insertPDF(imgpdf)          # 将当前页插入文档  if os.path.exists("allimages.pdf"):    os.remove("allimages.pdf")  doc.save("allimages.pdf")          # 保存pdf文件  doc.close()if __name__ == '__main__':  pic2pdf()