如何解决json.dumps的str问题？

Question

Hello, could someone helps me with this please?

TypeError: POST data should be bytes or an iterable of bytes. It can not be of type str.

import json
import urllib.request
from urllib.request import urlopen

postdata = {
    'datetime': str(calendar.timegm(time.gmtime())),
    'sensorId': "1",
    'tempRecord': str(read_temp())
}

req = Request(url)
req.add_header('Content-Type','application/json')
data = json.dumps(postdata)

response = urlopen(req,data)

Answer 1

You should use:

response = urlopen(req, data.encode())

Why?

Because json.dump(postdata) returns a str object,

whereas urlopen expects a bytes object.

So you have to convert data from str to bytes , and you do this using encode .