From f179381b64ee3cb8b646f484b289ec39a09a14b2 Mon Sep 17 00:00:00 2001
From: fredfortier <fredfortier@gmail.com>
Date: Tue, 24 Oct 2017 23:41:37 -0400
Subject: [PATCH] Small python 3 fixes

---
 catalyst/exchange/exchange_algorithm.py    |  1 +
 catalyst/exchange/exchange_utils.py        |  8 ++++----
 catalyst/exchange/poloniex/poloniex_api.py | 12 ++++++++++--
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/catalyst/exchange/exchange_algorithm.py b/catalyst/exchange/exchange_algorithm.py
index a96f893c..6650fda2 100644
--- a/catalyst/exchange/exchange_algorithm.py
+++ b/catalyst/exchange/exchange_algorithm.py
@@ -556,6 +556,7 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
         except Exception as e:
             log.warn('unable to calculate performance: {}'.format(e))
 
+        # TODO: pickle does not seem to work in python 3
         try:
             save_algo_object(
                 algo_name=self.algo_namespace,
diff --git a/catalyst/exchange/exchange_utils.py b/catalyst/exchange/exchange_utils.py
index 05a17435..2e3982f0 100644
--- a/catalyst/exchange/exchange_utils.py
+++ b/catalyst/exchange/exchange_utils.py
@@ -1,7 +1,7 @@
 import json
 import os
 import pickle
-from six.moves.urllib.request import urlretrieve
+from six.moves.urllib import request
 from datetime import date, datetime
 
 import pandas as pd
@@ -33,7 +33,7 @@ def get_exchange_symbols_filename(exchange_name, environ=None):
 def download_exchange_symbols(exchange_name, environ=None):
     filename = get_exchange_symbols_filename(exchange_name)
     url = SYMBOLS_URL.format(exchange=exchange_name)
-    response = urlretrieve(url=url, filename=filename)
+    response = request.urlretrieve(url=url, filename=filename)
     return response
 
 
@@ -154,8 +154,8 @@ def save_algo_df(algo_name, key, df, environ=None, rel_path=None):
 
     filename = os.path.join(folder, key + '.csv')
 
-    with open(filename, 'wb') as handle:
-        df.to_csv(handle)
+    with open(filename, 'wt') as handle:
+        df.to_csv(handle, encoding='UTF_8')
 
 
 def get_exchange_minute_writer_root(exchange_name, environ=None):
diff --git a/catalyst/exchange/poloniex/poloniex_api.py b/catalyst/exchange/poloniex/poloniex_api.py
index 158b5fa2..8bf6bb83 100644
--- a/catalyst/exchange/poloniex/poloniex_api.py
+++ b/catalyst/exchange/poloniex/poloniex_api.py
@@ -92,12 +92,20 @@ class Poloniex_api(object):
                                  post_data.encode('utf-8'),
                                  hashlib.sha512).hexdigest()
             headers = {'Sign': signature, 'Key': self.key}
+
+            post_data = post_data.encode('utf-8')
         else:
             raise ValueError(
-                'Method "' + method + '" not found in neither the Public API or Trading API endpoints')
+                'Method "' + method + '" not found in neither the Public API '
+                                      'or Trading API endpoints'
+            )
 
         self.ask_request()
-        req = urllib.request.Request(url, data=post_data, headers=headers)
+        req = urllib.request.Request(
+            url,
+            data=post_data,
+            headers=headers
+        )
         return json.loads(urlopen(req).read())
 
     def returnticker(self):