import requests
from requests.auth import HTTPBasicAuth

USERNAME = "i_cant_tell_you_guys"
PASSWORD = "definitely_cant_share_this"

auth = HTTPBasicAuth(USERNAME, PASSWORD)

URL = "https://the.website.com/mobile/rest/reportservice/exportReport?name=shared%2FMV+Report.ppr&format=csv&showTotals=false&valueDate=Today"

resp = requests.get(URL.format(USERNAME, PASSWORD), auth=auth, verify=False)

print resp.content