对python中的six.moves模块的下载函数urlretrieve详解

from six.moves import urllib
import os
import sys
import tensorflow as tf
import tarfile
FLAGS = tf.app.flags.FLAGS#提取系统参数作用的变量
tf.app.flags.DEFINE_string(\'dir\',\'D:/download_html\',\'directory of html\')#将下载目录保存到变量dir中,通过FLAGS.dir提取
directory = FLAGS.dir#从FLAGS中提取dir变量
url = \'http://www.cs.toronto.edu/~kriz/cifar-10-binary.tar.gz\'
filename = url.split(\'/\')[-1]#-1表示分割后的最后一个元素
filepath = os.path.join(directory,filename)
if not os.path.exists(directory):
 os.makedirs(directory)
if not os.path.exists(filepath):
 def _recall_func(num,block_size,total_size):
 sys.stdout.write(\'\\r>> downloading %s %.1f%%\' % (filename,float(num*block_size)/float(total_size)*100.0))
 sys.stdout.flush()
 urllib.request.urlretrieve(url,filepath,_recall_func)
 print()
 file_info = os.stat(filepath)
 print(\'Successfully download\',filename,file_info.st_size,\'bytes\')
tar = tarfile.open(filepath,\'r:gz\')#指定解压路径和解压方式为解压gzip
tar.extractall(directory)#全部解压

from six.moves import urllib
import os
import sys
import tensorflow as tf
FLAGS = tf.app.flags.FLAGS#提取系统参数作用的变量
tf.app.flags.DEFINE_string(\'dir\',\'D:/download_html\',\'directory of html\')#将下载目录保存到变量dir中,通过FLAGS.dir提取
directory = FLAGS.dir#从FLAGS中提取dir变量
url = \'http://www.douyu.com/\'
filename = \'douyu.html\'#保存成你想要的名字，这里保存成douyu.html
filepath = os.path.join(directory,filename)
if not os.path.exists(directory):
 os.makedirs(directory)
if not os.path.exists(filepath):
 def _recall_func(num,block_size,total_size):
 sys.stdout.write(\'\\r>> downloading %s %.1f%%\' % (filename,float(num*block_size)/float(total_size)*100.0))
 sys.stdout.flush()
 urllib.request.urlretrieve(url,filepath,_recall_func)
 print()
 file_info = os.stat(filepath)#获取文件信息
 print(\'Successfully download\',filename,file_info.st_size,\'bytes\')#.st_size文件的大小，以字节为单位