Python requests, no attribute 'body'

Question

I am trying to run a code similar to the one in this question: How do I sign a POST request using HMAC-SHA512 and the Python requests library?

I have the following code:

import requests
import hmac
import hashlib
from itertools import count
import time

headers = { 'nonce': '',
        'Key' : 'myKey',
        'Sign': '',}
payload = { 'command': 'returnCompleteBalances',
            'account': 'all'}
secret = 'mySecret'

NONCE_COUNTER = count(int(time.time() * 1000))
headers['nonce'] = next(NONCE_COUNTER)

request = requests.Request(
    'POST', 'https://poloniex.com/tradingApi',
    params=payload, headers=headers)
signature = hmac.new(secret, request.body, digestmod=hashlib.sha512)
request.headers['Sign'] = signature.hexdigest()

with requests.Session() as session:
    response = session.send(request)

The following line :

signature = hmac.new(secret, request.body, digestmod=hashlib.sha512)

Throws this error: 'Request' object has no attribute 'body'

I get a similar error: 'Request' object has no attribute 'content' — Mustard Tiger, Nov 11 '17 at 05:05
Try to add a .prepare() in request object: request = requests.Request( 'POST', 'https://poloniex.com/tradingApi', params=payload, headers=headers).prepare() — Gui, Nov 11 '17 at 05:08
request = requests.Request('POST', 'https://poloniex.com/tradingApi', params=payload, headers=headers).prepare() this seemed to work while keeping requests.body — Mustard Tiger, Nov 11 '17 at 05:18
The result itself works, but unfortunately i am now getting 'error': 'Invalid Command' for a response — Mustard Tiger, Nov 11 '17 at 05:23
Why don't you just do a `json.dumps(payload)` and create a `sha512` of that and add it into the header fields and simply do a `request.post(url, data=payload, headers=headers)`. This will make your life easier — Ahmed Dhanani, Nov 11 '17 at 06:11

xhancar · Accepted Answer · 2017-11-11T23:38:04.993

Your source code has several problems:

For the POST method you can't use the argument params, but you need the argument data.
As mentioned before, you need the .prepare() method.
The parameter nonce needs to be specified also in payload, not in headers.

This should work:

import requests
import hmac
import hashlib
from itertools import count
import time

NONCE_COUNTER = count(int(time.time() * 1000))

headers = { 'Key' : 'myKey',
            'Sign': '',}

payload = { 'nonce': next(NONCE_COUNTER),
            'command': 'returnCompleteBalances',
            'account': 'all'}

secret = 'mySecret'


request = requests.Request(
    'POST', 'https://poloniex.com/tradingApi',
    data=payload, headers=headers).prepare()
signature = hmac.new(secret, request.body, digestmod=hashlib.sha512)
request.headers['Sign'] = signature.hexdigest()


with requests.Session() as session:
    response = session.send(request)

Python requests, no attribute 'body'

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