From 09c42da64a82571af543ab33ff5a3431ae7e8704 Mon Sep 17 00:00:00 2001
From: Guillaume Horel <guillaume.horel@serenitascapital.com>
Date: Mon, 7 Nov 2016 13:24:02 -0500
Subject: style

---
 pyisda/utils.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pyisda/utils.py b/pyisda/utils.py
index 049832a..a2b1e5e 100644
--- a/pyisda/utils.py
+++ b/pyisda/utils.py
@@ -87,8 +87,8 @@ def build_yc(trade_date, ql_curve = False):
         periods_swaps, rates_swaps = zip(*markit_data['swaps'])
         types = 'M' * len(periods) + 'S' * len(periods_swaps)
         rates = array.array('d', rates)
-        periods.extend(periods_swaps)
-        rates.extend(rates_swaps)
+        periods += periods_swaps)
+        rates += rates_swaps)
         yc = YieldCurve(trade_date, types, periods, rates, 'ACT/360', '6M',
                         '3M', '30/360', 'ACT/360', BadDay.MODIFIED)
     return yc
-- 
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