如何在python中发布请求的有效负载？

import requests

url = "https://example.com/api/endpoint"
payload = {"key1": "value1", "key2": "value2"}

response = requests.post(url, data=payload)

import json

url = "https://example.com/api/endpoint"
payload = {"key1": "value1", "key2": "value2"}

response = requests.post(url, json=payload)

url = "https://example.com/api/endpoint"
files = {"file": open("path/to/file.txt", "rb")}

response = requests.post(url, files=files)