From cc275dd65d417c67505e692a3a4f438da4a796e5 Mon Sep 17 00:00:00 2001
From: Ondrej Certik <ondrej@certik.cz>
Date: Sat, 27 Oct 2007 11:32:22 +0200
Subject: [PATCH] Fixes the sympify("exp(x)") problem, issue 439.

---
 sympy/core/parser.py               | 7 +++++++
 sympy/core/tests/test_functions.py | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/sympy/core/parser.py b/sympy/core/parser.py
index 5c72c9c..6e4969b 100644
--- a/sympy/core/parser.py
+++ b/sympy/core/parser.py
@@ -650,6 +650,13 @@ class Identifier(StringBase):
         obj = Basic.singleton.get(self.string)
         if obj is not None:
             return obj()
+        import sympy
+        try:
+            #is self some kind of SymPy function?
+            return eval(self.string, sympy.__dict__)
+        except:
+            #no, it isn't...
+            pass
         return Basic.Symbol(self.string)
 
 
diff --git a/sympy/core/tests/test_functions.py b/sympy/core/tests/test_functions.py
index c9aafbe..d2de8dd 100644
--- a/sympy/core/tests/test_functions.py
+++ b/sympy/core/tests/test_functions.py
@@ -131,3 +131,11 @@ def test_combine():
 
     assert (2*exp(x)*exp(-x)).combine() == 2
     assert (x/exp(x)*exp(-x)).combine() == x*exp(-2*x)
+
+
+def test_439():
+    v = sympify("exp(x)")
+    x = Symbol("x")
+    assert v == exp(x)
+    assert type(v) == type(exp(x))
+    assert str(type(v)) == str(type(exp(x)))
-- 
2.11.4.GIT