如何在python中向POST请求传递参数

import urllib.parse
import urllib.request

url = "http://example.com/api"
params = {"param1": "value1", "param2": "value2"}

data = urllib.parse.urlencode(params).encode("utf-8")
req = urllib.request.Request(url, data=data, method="POST")
response = urllib.request.urlopen(req)
result = response.read().decode("utf-8")

import requests

url = "http://example.com/api"
params = {"param1": "value1", "param2": "value2"}

response = requests.post(url, data=params)
result = response.text

import json
import urllib.request

url = "http://example.com/api"
params = {"param1": "value1", "param2": "value2"}

data = json.dumps(params).encode("utf-8")
req = urllib.request.Request(url, data=data, headers={"Content-Type": "application/json"}, method="POST")
response = urllib.request.urlopen(req)
result = response.read().decode("utf-8")