python pdf 转图片压缩

import fitz
import os

def covert2pic(zoom):
    if os.path.exists('.pdf'):
        os.removedirs('.pdf')
    os.mkdir('.pdf')
    for pg in range(totaling):
        page  = doc.load_page(pg)
        zoom  = int(zoom)
        lurl  = '.pdf/%s.png' % str(pg+1)
        trans = fitz.Matrix(zoom/100.0,zoom/100.0)
        pm    = page.get_pixmap(matrix=trans,alpha=False)
        pm.save(lurl)
        print(page)
    doc.close()

def pic2pdf(obj):
    doc = fitz.open()
    for pg in range(totaling):
        img      = '.pdf/%s.png' % str(pg+1)
        imgdoc   = fitz.open(img)
        pdfbytes = imgdoc.convert_to_pdf()
        imgpdf   = fitz.open("pdf",pdfbytes)
        os.remove(img)
        doc.insert_pdf(imgpdf)
    if os.path.exists(obj):
        os.remove(obj)
    doc.save(obj)
    doc.close()

def pdfz(sor,obj,zoom):
    covert2pic(zoom)
    pic2pdf(obj)

if __name__ == "__main__":
# ===============================================
# 运行前修改以下三个参数
    zoom = 100 #50代表缩小50%，200代表放大200%，100代表既不放大也不缩小
    sor  = "Input.pdf" #输入文件名
    obj  = "Input_Compressed.pdf" #输出文件名 
# ===============================================
    doc  = fitz.open(sor)
    totaling = doc.page_count
    pdfz(sor,obj,zoom)
    os.removedirs('.pdf')