From 6e3e3eccd61b166665b766512ef93bbab3a8e065 Mon Sep 17 00:00:00 2001
From: Elaine Hale <elaine.hale@nrel.gov>
Date: Wed, 3 Oct 2018 19:53:42 -0600
Subject: [PATCH] read_gdx.Translator now captures copies of the
 GdxSymbol.dataframes rather than the originals. Closes #32

---
 gdxpds/read_gdx.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/gdxpds/read_gdx.py b/gdxpds/read_gdx.py
index 342053e..9f8ddc8 100644
--- a/gdxpds/read_gdx.py
+++ b/gdxpds/read_gdx.py
@@ -40,7 +40,6 @@
 '''
 
 from collections import OrderedDict
-import copy
 import logging
 
 # gdxpds needs to be imported before pandas to try to avoid library conflict on 
@@ -94,7 +93,7 @@ def dataframes(self):
             for symbol in self.__gdx:
                 if not symbol.loaded:
                     symbol.load()
-                self.__dataframes[symbol.name] = symbol.dataframe
+                self.__dataframes[symbol.name] = symbol.dataframe.copy()
         return self.__dataframes
 
     @property
@@ -107,7 +106,7 @@ def dataframe(self, symbol_name):
         if not self.gdx[symbol_name].loaded:
             self.gdx[symbol_name].load()
         # This was returning { symbol_name: dataframe }, which seems intuitively off.
-        return self.gdx[symbol_name].dataframe
+        return self.gdx[symbol_name].dataframe.copy()
 
 def to_dataframes(gdx_file,gams_dir=None):
     """