From: Vivien Maisonneuve <v.maisonneuve@gmail.com>
Date: Tue, 9 Sep 2014 09:02:20 +0000 (+0200)
Subject: Make Expression.subs() always return a LinExpr instance
X-Git-Tag: 1.0.2~1
X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/commitdiff_plain/1044e58e639333d281d47739ba9ecef607ff14e6?ds=sidebyside

Make Expression.subs() always return a LinExpr instance
---

diff --git a/linpy/linexprs.py b/linpy/linexprs.py
index 3c00f22..f361218 100644
--- a/linpy/linexprs.py
+++ b/linpy/linexprs.py
@@ -306,7 +306,7 @@ class LinExpr:
         for symbol in substitutions:
             if not isinstance(symbol, Symbol):
                 raise TypeError('symbols must be Symbol instances')
-        result = self._constant
+        result = Rational(self._constant)
         for symbol, coefficient in self._coefficients.items():
             expression = substitutions.get(symbol, symbol)
             result += coefficient * expression