From c06f8b77933b3b18615875e67fa6bfe581ca8afe Mon Sep 17 00:00:00 2001
From: Stephan Seitz <stephan.seitz@fau.de>
Date: Fri, 2 Aug 2019 19:20:26 +0200
Subject: [PATCH] Implement Assignment.__hash__ for sympy <= 1.4
---
pystencils/assignment.py | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/pystencils/assignment.py b/pystencils/assignment.py
index 45a95d41e..0bf687994 100644
--- a/pystencils/assignment.py
+++ b/pystencils/assignment.py
@@ -49,6 +49,17 @@ else:
__str__ = assignment_str
_print_Assignment = print_assignment_latex
+# Apparently, in SymPy 1.4 Assignment.__hash__ is not implemented. This has been fixed in current master
+try:
+ sympy_version = sp.__version__.split('.')
+
+ if int(sympy_version[0]) <= 1 and int(sympy_version[1]) <= 4:
+ def hash_fun(self):
+ return hash((self.lhs, self.rhs))
+ Assignment.__hash__ = hash_fun
+except Exception:
+ pass
+
def assignment_from_stencil(stencil_array, input_field, output_field,
normalization_factor=None, order='visual') -> Assignment:
--
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