Bug#952251: sympy: FTBFS: make[2]: python: Command not found

[Steve Langasek]

Package: sympy
Followup-For: Bug #952251
User: ubuntu-devel at lists.ubuntu.com
Usertags: origin-ubuntu focal ubuntu-patch

This should be addressed by fixing the upstream build rules to invoke
python3 instead of python.  Please find attached a patch which has been
uploaded to Ubuntu to fix this failure.

Cheers,
-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                   https://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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diff -Nru sympy-1.5.1/debian/patches/python3-not-python.patch sympy-1.5.1/debian/patches/python3-not-python.patch
--- sympy-1.5.1/debian/patches/python3-not-python.patch	1969-12-31 16:00:00.000000000 -0800
+++ sympy-1.5.1/debian/patches/python3-not-python.patch	2020-02-28 09:23:34.000000000 -0800
@@ -0,0 +1,17 @@
+Author: Steve Langasek <steve.langasek at ubuntu.com>
+Description: invoke python3 for building, not the deprecated python.
+Last-Update: 2020-02-28
+Bug-Debian: https://bugs.debian.org/952251
+
+Index: sympy-1.5.1/doc/Makefile
+===================================================================
+--- sympy-1.5.1.orig/doc/Makefile
++++ sympy-1.5.1/doc/Makefile
+@@ -1,6 +1,6 @@
+ # Makefile for Sphinx documentation
+ #
+-PYTHON       = python
++PYTHON       = python3
+ RST2HTML     = rst2html
+ 
+ # You can set these variables from the command line.
diff -Nru sympy-1.5.1/debian/patches/series sympy-1.5.1/debian/patches/series
--- sympy-1.5.1/debian/patches/series	2020-02-07 09:53:35.000000000 -0800
+++ sympy-1.5.1/debian/patches/series	2020-02-28 09:23:34.000000000 -0800
@@ -3,3 +3,4 @@
 03_sphinx_conf.patch
 04_doc_makefile.patch
 05_sphinx_math_dollar.patch
+python3-not-python.patch