Adapt to changes in python 3.7.

sympy-python3.patch

@@ -0,0 +1,11 @@
+--- python3/sympy/assumptions/sathandlers.py.orig	2017-07-26 16:46:12.000000000 -0600
++++ python3/sympy/assumptions/sathandlers.py	2018-06-27 07:04:03.105607298 -0600
+@@ -1,6 +1,7 @@
+ from __future__ import print_function, division
+ 
+-from collections import MutableMapping, defaultdict
++from collections import defaultdict
++from collections.abc import MutableMapping
+ 
+ from sympy.core import (Add, Mul, Pow, Integer, Number, NumberSymbol,)
+ from sympy.core.numbers import ImaginaryUnit

sympy.spec

@@ -5,6 +5,8 @@ Summary:        A Python library for symbolic mathematics
 License:        BSD
 URL:            http://sympy.org/
 Source0:        https://github.com/%{name}/%{name}/archive/%{name}-%{version}.tar.gz
+# Adapt to changes in python 3.7
+Patch0:         %{name}-python3.patch
 
 BuildArch:      noarch
 
@@ -120,6 +122,7 @@ sed -i 's/StrictVersion/LooseVersion/g' %{sympydir}/sympy/external/importtools.p
 
 # Make a copy for building the python3 version
 cp -a %{sympydir} python3
+%patch0
 
 # One test gets an extra warning with python3
 sed -i '/Adaptive meshing could not be applied/d' \