python:post请求request方法步骤

import urllib.request
import urllib.parse
#1.设定目标网址
url = “目标网址”
#2.设定post请求提交的变量值
postdata =urllib.parse.urlencode({“字典类型值”}).encode(“utf-8”)
#3.提交申请
req = urllib.request.Request(url,postdata)
#4.获取数据
data=urllib.request.urlopen(req).read().decode(“utf-8”,ignore)