将图片从中间批量截两半

用到了PIL包，注意导包时应导入：Pillow
核心代码如下

            from PIL import Image
            import os

            path = r"C:\Users\dell\Desktop\111"  # change this dirpath.
            listdir = os.listdir(path)

            newdir = os.path.join(path, 'split')  # make a new dir in dirpath.
            if (os.path.exists(newdir) == False):
                os.mkdir(newdir)
            for i in listdir:
                if '.png' in i:  # the format of zed img.
                    filepath = os.path.join(path, i)
                    print(filepath)
                    filename = i.replace('.png','')
                    uppath = os.path.join(newdir, filename)
                    downpath = os.path.join(newdir, filename) + "_down.png"

                    img = Image.open(filepath)
                    size = img.size
                    # 准备将图片横向切割成2张小图片
                    weight = int(size[0])
                    height = int(size[1] // 2)
                    for i in range(2):
                        box = (0, height* i , weight, height * (i + 1))
                        region = img.crop(box)
                        region.save(uppath+'_'+str(i)+'.png')