From fd25ef40eaaedde075b7906a612120f395c7489b Mon Sep 17 00:00:00 2001
From: Dan Howe <d.howe@wrl.unsw.edu.au>
Date: Mon, 10 Sep 2018 07:34:35 +1000
Subject: [PATCH] Update calls to deprecated __getitem__() method

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

diff --git a/scaling/froude.py b/scaling/froude.py
index 456f9bb..b1b3fec 100644
--- a/scaling/froude.py
+++ b/scaling/froude.py
@@ -7,8 +7,8 @@ def _convert(x, length_scale_factor, from_unit, to_unit):
     ureg = pint.UnitRegistry()
 
     # Calculate unit conversion factor
-    from_unit = ureg[from_unit]
-    to_unit = ureg[to_unit]
+    from_unit = ureg(from_unit)
+    to_unit = ureg(to_unit)
     unit_conversion_factor = (1 * from_unit).to(to_unit).magnitude
 
     # Define Froude scaling relationships