From: Vivien Maisonneuve <v.maisonneuve@gmail.com>
Date: Thu, 19 Jun 2014 07:15:55 +0000 (+0200)
Subject: Fix Expression.__hash__
X-Git-Tag: 1.0~237
X-Git-Url: https://scm.cri.ensmp.fr/git/linpy.git/commitdiff_plain/383296fc80db17317dd385821265003c01134f50?ds=inline

Fix Expression.__hash__
---

diff --git a/pypol/linear.py b/pypol/linear.py
index 8f73fd3..2c71c02 100644
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -271,7 +271,7 @@ class Expression:
                 self.constant == other.constant
 
     def __hash__(self):
-        return hash((self._coefficients, self._constant))
+        return hash((tuple(sorted(self._coefficients.items())), self._constant))
 
     def _toint(self):
         lcm = functools.reduce(lambda a, b: a*b // gcd(a, b),