python coinbase api fetch

import hashlib
import hmac
import urllib2
import time


API_KEY = 'xxx'
# I obviously supressed the key and secret
API_SECRET = 'xxx'

def get_http(url, body=None):
  opener = urllib2.build_opener()
  nonce = int(time.time() * 1e6)
  message = str(nonce) + url + ('' if body is None else body)
  signature = hmac.new(API_SECRET, message, hashlib.sha256).hexdigest()
  opener.addheaders = [('ACCESS_KEY', API_KEY),
                       ('ACCESS_SIGNATURE', signature),
                       ('ACCESS_NONCE', nonce)]
  try:
    return opener.open(urllib2.Request(url, body))
  except urllib2.HTTPError as e:
    print e
    return e

transdata =  get_http('https://coinbase.com/api/v1/transfers').read()

f1 = open('./DUMP.txt' , 'w+')

# this is where the program creates a file DUMP.txt and writes the relevant data fetched.  Re running the program
# overwrites DUMP.txt

f1.write( transdata )