python3图片裁剪+转换pdf+压缩

本地大量长图，要发送给别人，所以要对图片进行裁剪+转换pdf+压缩

 import zipfile
 import os
 from concurrent.futures import ThreadPoolExecutor
 from reportlab.lib.pagesizes import A4, landscape
 from reportlab.pdfgen import canvas
 from PIL import Image
 import time

 # 设置全局变量
 filepath = "../jpg/cartoon/"
 outzipfilepath = "../jpg/cartoonzip/"
 outpdffilepath = "../jpg/cartoonpdf/"
 cropimgpath = "../jpg/image/"

 # 找出文件夹下所有.xml后缀的文件
 def listfiles(rootdir, prefix='.xml'):
     file = []
     for parent, dirnames, filenames in os.walk(rootdir):
         if parent == rootdir:
             for filename in filenames:
                 if filename.endswith(prefix):
                     file.append(filename)
             return file
         else:
             pass

 # 创建文件夹
 def createjia(path):
     try:
         os.makedirs(path)
     except:
         pass

 # 这里是裁剪图片
 # 传入的是图片的名字
 def cropimg_tranpdf(imgname):
     # 新生成的文件夹的名字
     tempfilename = str(imgname.replace(".png", ""))

     # 创建保存裁剪后的图片的文件夹
     createpath = "../jpg/image/" + str(tempfilename)
     createjia(createpath)

     # 打开图片
     imgpath = filepath + imgname
     img = Image.open(imgpath)

     # 获得图片的宽高
     width = int(img.size[0])
     height = int(img.size[1])

     # A4的宽1240，高1754
     # 制作裁剪坐标
     countheight = (height // 1240)

     # 设置初始高度为1240
     newheight = 1240

     # 将要保存的pdf的位置和名字
     pdfname = str(outpdffilepath) + str(tempfilename) + ".pdf"
     # A4的大小
     # 发现A4会把长图压缩成1张A4的大小
     (w, h) = landscape(A4)
     # 保存pdf
     c = canvas.Canvas(str(pdfname), pagesize=landscape(A4))
     # number of page
     for i in range(0, countheight):
         newheight = newheight + 1240
         # 裁剪的位置
         # (起始宽的位置，起始高的位置，裁剪宽度，裁剪高度)
         # 左上角的坐标为(0,0)
         region = (0, newheight - 1240, width, newheight)
         # 裁剪
         cropImg = img.crop(region)
         # 保存
         jpgname = str(i) + ".jpg"
         # 保存裁剪后的图片
         cropImg.save(str(createpath) + "/" + str(jpgname))

         # 写入的jpg将其组合成pdf
         filepath_jpgname = str(createpath) + "/" + str(jpgname)
         c.drawImage(filepath_jpgname, 0, 0, w, h)
         c.showPage()
     c.save()
     print("完成PDF：" + str(tempfilename))

 # 这里是裁剪和转化pdf的多进程
 # 开启多进程
 def threadingcrop_pdf(number):
     # 进程数
     pool = ThreadPoolExecutor(int(number))
     # 读取文件夹名字
     namelist = listfiles(filepath, "png")

     # 进程开跑
     for name in namelist:
         print(name)
         pool.submit(cropimg_tranpdf, name)
         # 太快电脑受不了
         time.sleep(1)

 # 这里传入的是pdf的名字
 # 写入压缩文件
 def zipfiles(names):
     # 需要压缩到的文件目录和名字
     zipname = str(outzipfilepath) + str(names.replace(".pdf", "")) + ".zip"
     # 需要压缩的文件位置和名字
     name = outpdffilepath + names
     files = zipfile.ZipFile(zipname, 'w', zipfile.ZIP_DEFLATED)

     # 写入压缩包
     files.write(name)
     files.close()
     print("完成压缩：" + str(zipname))

 # 这里是压缩zip的多进程
 # 开启多进程
 def threadingzip(number):
     # 先转化为pdf
     threadingcrop_pdf(number)
     # 进程数
     pool = ThreadPoolExecutor(int(number))
     # 读取文件名字
     namelist = listfiles(outpdffilepath, "pdf")
     # 进程开跑
     for name in namelist:
         print(name)
         pool.submit(zipfiles, name)
         # 太快电脑受不了
         time.sleep(1)

 if __name__ == '__main__':
     # 多进程
     #number = 1
     #threadingzip(number)

     # 写入pdf
     namelistpdf = listfiles(filepath, "png")
     for name in namelistpdf:
         print(name)
         cropimg_tranpdf(name)

     # 写入zip
     namelistzip = listfiles(outpdffilepath, "pdf")
     for name in namelistzip:
         print(name)
         zipfiles(name)