Question

求详细解释下python代码

def eachFile(filepath):
count = 0
pathDir = os.listdir(filepath)
for allDir in pathDir:
child = os.path.join('%s%s' % (filepath,allDir))
write_child = os.path.join('%s%s' % (write_path,allDir))
img = load_img(child)
nul_num = re.findall(r"\d",child)
nul_num = int(nul_num[0])
x = img_to_array(img)
x = x.reshape((1,)+x.shape)
i = 0
for batch in datagen.flow(
x,
batch_size =1,
save_to_dir = write_path,
save_prefix = nul_num,save_format = 'jpeg'):
count += 1

i += 1
if i >= 10 :
break
return count

Answer 1

这段代码的意思是循环查找目录下的图片文件，截取文件名中代数字的，重新保存到另外一个目录

追问

nul_num = re.findall(r"\d",child)
nul_num = int(nul_num[0])取第一个数字有什么意义
下面这两句话是什么意思