{"errorCode":"118","message":"The request body is empty"}

import json, requests


consumer_key = "3MVG9ZL0ppGP5UrB2Sh2lonpKJkgWlzWSQqTZLng6f1WdxYWnxj6DsERseHPRiJi5DFjiZBjUTO6RBuPgBZ1G"
consumer_secret = "xxxx"
username = "xxxx"
password = "xxxx"

payload = {
    'grant_type': 'password',
    'client_id': consumer_key,
    'client_secret': consumer_secret,
    'username': username,
    'password': password
}

r = requests.post("https://login.salesforce.com/services/oauth2/token",
    headers={"Content-Type":"application/x-www-form-urlencoded"},
    data=payload)


print r.content
body = json.loads(r.content)
token = body["access_token"]
saqlquery = "q = load "0Fb28000000PBfqCAG/0Fc28000000Ag0nCAC;";q = group q by 'Name';q = foreach q generate 'Name' as 'Name', sum('Amount') as 'sum_Amount';}"
url = body["instance_url"] + "/services/data/v36.0/wave/query"

r = requests.post(url, headers = {"Authorization":"Bearer " + token}, data = {"query":saqlquery});

print r.content