From d50c19778145f85567e3b5f0e569a280f19410a8 Mon Sep 17 00:00:00 2001
From: Andy Geach <andy@bugorfeature.net>
Date: Mon, 13 Jan 2025 12:05:23 +0000
Subject: [PATCH] proposed fix for mixed index dataframe bug

---
 systems/portfolio.py | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/systems/portfolio.py b/systems/portfolio.py
index cc4d11f7f5..116de59ab8 100644
--- a/systems/portfolio.py
+++ b/systems/portfolio.py
@@ -727,16 +727,20 @@ def _add_zero_weights_to_instrument_weights_df(
         instrument_list_to_add = (
             self.allocate_zero_instrument_weights_to_these_instruments()
         )
-        weight_index = instrument_weights.index
-        new_pd_as_dict = dict(
-            [
-                (instrument_code, pd.Series([0.0] * len(weight_index)))
-                for instrument_code in instrument_list_to_add
-            ]
-        )
-        new_pd = pd.DataFrame(new_pd_as_dict)
-
-        padded_instrument_weights = pd.concat([instrument_weights, new_pd], axis=1)
+        # weight_index = instrument_weights.index
+        # new_pd_as_dict = dict(
+        #     [
+        #         (instrument_code, pd.Series([0.0] * len(weight_index)))
+        #         for instrument_code in instrument_list_to_add
+        #     ]
+        # )
+        # new_pd = pd.DataFrame(new_pd_as_dict)
+        #
+        # padded_instrument_weights = pd.concat([instrument_weights, new_pd], axis=1)
+
+        padded_instrument_weights = copy(instrument_weights)
+        for zero_instr in instrument_list_to_add:
+            padded_instrument_weights[zero_instr] = 0.0
 
         return padded_instrument_weights