python 上传文件下载图片

python 2.7

poster-0.8.1

requests-2.7.0

#coding:utf-8
import urllib
import urllib2
import sys
import time
import json
import requests
from poster.encode import multipart_encode
from poster.streaminghttp import register_openers
import urllib2

#上传
register_openers()
datagen, headers = multipart_encode({"uKey":"xxxxx","_api_key":"xxxxx","file":open('OpenCourse2.9.6.apk', 'rb'),"installType":"1","password":"","updateDescription":"test"})

request=urllib2.Request("http://www.pgyer.com/apiv1/app/upload",datagen, headers)
response=urllib2.urlopen(request).read().encode('utf-8')
print response
start=response.find('appQRCodeURL')
end=response.find('\"}}',start)
PNGURL=response[start+15:end]
PNGURLs=PNGURL.replace('\\', '')
print PNGURLs

#下载

pic=requests.get(PNGURLs)
string = r'qrcodeHistory/'+PNGURLs[-64:] + '.PNG'
fp = open(string,'wb')
fp.write(pic.content)
fp.close()
print "DONE"