import requests

url = 'https://api.dropboxapi.com/oauth2/token'
app_key = "m79mo7gg7mh8pez"
app_secret = "by93yed7as4qlmo"
access_code = "TEX7wlfjGgUAAAAAAAAANYydTr5XVeay4hFJyk_B2UA"

data = {
    'code': access_code,
    'grant_type': 'authorization_code'
}

headers = {
    'Content-Type': 'application/x-www-form-urlencoded'
}

response = requests.post(url, auth=(app_key, app_secret), data=data, headers=headers)