import csv

header = ['id', 'name', 'age']
data = [[1, 'zhangsan', 20], [2, 'lisi', 25]]

with open (filename, "w", newline='', encoding='utf-8') as csv_file :
    writer = csv.writer(csv_file)
    writer.writerow(header)
    writer.writerows(data)
    csv_file.close()

import requests
import json

headers = {'content-type': 'application/json'}
data = {'key':'value'}
response = requests.post(url,  json=data, headers=hd)
res = json.loads(response.text)