TypeError: POST data should be bytes, an iterable of bytes, or a file object. It cannot be of type s

我在是 学习的时候，代码中是python2.x 的版本用的是urllib2 库
我是改为urllib.requst

运行是提示

TypeError: POST data should be bytes, an iterable of bytes, or a file object. It cannot be of type str

解决办法。在 # 编码
data = urllib.parse.urlencode(submit_data).encode(“utf-8”)

# 编码（这个本来没有指定格式编码)
# data = urllib.parse.urlencode(submit_data)
# 加上encode("utf-8")
data = urllib.parse.urlencode(submit_data).encode("utf-8")


# 构造请求头，创建请求对象
headers = {
    "Accept" : "application/json, text/plain, */*",
    "User-Agent" : "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.7 Safari/537.36",
    "Accept-Language" : "zh-CN,zh;q=0.8"
}

req = urllib.request.Request(url,data,headers)

# 发送请求
response = urllib.request.urlopen(req)