import urllib.request
import urllib.parse
import json

url = 'https://aip.baidubce.com/rpc/2.0/nlp/v1/lexer?access_token=***'
headers = {
'Content-Type': 'application/json'
}

body = {
"text": "百度是一家高科技公司"
}

data = urllib.parse.urlencode(body).encode('gbk')

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

result = urllib.request.urlopen(request).read().decode('gbk')

print(json.loads(result))

代码如上，哪里写错了？返回

{'log_id': 3838837857684473751, 'error_code': 282004, 'error_msg': 'invalid parameter(s)'}