From d536189d3fd74a1c7e7d2cd87a6f53fbfb9efa0a Mon Sep 17 00:00:00 2001
From: Joachim Durchholz <toolforger@durchholz.org>
Date: Thu, 23 Apr 2015 00:00:01 +0200
Subject: [PATCH] Fix sympy/sympy#9326: use full symbol in evalf cache, not
 just symbol name

Old status: evalf_symbol used just the symbol name in its cache, this
would break if two symbols happened to use the same name.
This fix uses the full symbol instead.

// edited by skirpichev
---
 sympy/core/evalf.py            | 4 ++--
 sympy/core/tests/test_evalf.py | 8 ++++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/sympy/core/evalf.py b/sympy/core/evalf.py
index ed19f96e83e..128a87859af 100644
--- a/sympy/core/evalf.py
+++ b/sympy/core/evalf.py
@@ -1175,11 +1175,11 @@ def evalf_symbol(x, prec, options):
         if '_cache' not in options:
             options['_cache'] = {}
         cache = options['_cache']
-        cached, cached_prec = cache.get(x.name, (None, MINUS_INF))
+        cached, cached_prec = cache.get(x, (None, MINUS_INF))
         if cached_prec >= prec:
             return cached
         v = evalf(sympify(val), prec, options)
-        cache[x.name] = (v, prec)
+        cache[x] = (v, prec)
         return v
 
 evalf_table = None
diff --git a/sympy/core/tests/test_evalf.py b/sympy/core/tests/test_evalf.py
index aff47199361..480872c7e60 100644
--- a/sympy/core/tests/test_evalf.py
+++ b/sympy/core/tests/test_evalf.py
@@ -475,3 +475,11 @@ def test_issue_8853():
     assert get_integer_part(S.Half, 1, {}, True) == (1, 0)
     assert get_integer_part(-S.Half, -1, {}, True) == (-1, 0)
     assert get_integer_part(-S.Half, 1, {}, True) == (0, 0)
+
+
+def test_issue_9326():
+    from sympy import Dummy
+    d1 = Dummy('d')
+    d2 = Dummy('d')
+    e = d1 + d2
+    assert e.evalf(subs={d1: 1, d2: 2}) == 3