Python标准库学习笔记 urllib模块

lishenghan

　　利用缓存实现简单的获取



import urllib
import os
def reporthook(blocks_read,block_size,total_size):
if not blocks_read:
print 'Connection opened'
return
if total_size < 0:
print 'Read %d blocks ( %d bytes ) '%(blocks_read,blocks_read*block_size)
else:
amount_read = blocks_read*block_size
print 'Read %d blocks,or %d / %d'%\
(blocks_read,amount_read,total_size)
try:
filename,msg = urllib.urlretrieve('http://zt.xiaomi.com/bbszt/rom/miuiv4_ics7.0/miuiV4_Mioneplus_ICS7.0_4.0_fastboot_dj8428bjkq.exe',
reporthook=reporthook)
print
print 'File:',filename
print 'Headers'
print msg
print 'File exists before cheanup',os.path.exists(filename)
finally:
#urllib.urlcleanup()
print ' File still exists:', os.path.exists(filename)

　　参数编码：



import urllib
query_args = {'q':'query string','foo':'bar'}
encoded_args = urllib.urlencode(query_args)
print 'Encoded:',encoded_args
query_args = {'q':['query string','bar']}
print urllib.urlencode(query_args,doseq=True)#同一个名称与多个值关联 doseq = True

　　路径与URL转换



import os
from urllib import pathname2url,url2pathname
print '== Windows =='
path = r'\a\b\c'#不包含驱动器字母
print 'Original:',path
print 'URL     :',pathname2url(path)
print 'Path    :',url2pathname('/d/e/f')
print
path = r'C:\a\b\c'#包含驱动器字母
print 'Original:',path
print 'URL     :',pathname2url(path)

asd