Hi,
Shouldn't AM_PATH_PYTHON check for the python3 command before python?
The full recommendation of how these should be setup is in PEP 394
[1].
On modern systems I don't think it should matter. On Fedora 40:
$ command -v python
/usr/bin/python
$ command -v python3
/usr/bin/python3
$ python --version
Python 3.12.3
$ python3 --version
Python 3.12.3
The difference mostly exists on older machines. On CentOS 7.9 for
example:
$ command -v python
/usr/bin/python
$ command -v python3
/usr/bin/python3
$ python --version
Python 2.7.5
$ python3 --version
Python 3.6.8
I've attached a proposed path. I don't see a situation where a
python3.* is installed without a python3 link. Therefore checking for
python3 and fallingback on python seems reasonable to me.
Collin
[1] https://peps.python.org/pep-0394/From cd88a2461f0c89c2e70a7fc3a17058fb989313d4 Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.fu...@gmail.com>
Date: Thu, 20 Jun 2024 02:26:52 -0700
Subject: [PATCH] python: Prefer python3 over python
* m4/python.m4 (AM_PATH_PYTHON): Check for python3 before python.
* NEWS: Document that python3 is used first.
---
NEWS | 2 +-
m4/python.m4 | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/NEWS b/NEWS
index 77347e5a3..99c562f15 100644
--- a/NEWS
+++ b/NEWS
@@ -7,7 +7,7 @@ New in 1.17:
* New features added
- - AM_PATH_PYTHON will, after checking "python", prefer any Python 3
+ - AM_PATH_PYTHON will, after checking "python3", prefer any Python 3
version (latest versions checked first) over any Python 2
version. If a specific version of Python 2 is still needed, the
$PYTHON variable should be set beforehand.
diff --git a/m4/python.m4 b/m4/python.m4
index 0b1db2689..21116e1a3 100644
--- a/m4/python.m4
+++ b/m4/python.m4
@@ -37,7 +37,7 @@ AC_DEFUN([AM_PATH_PYTHON]
dnl Find a Python interpreter. Python versions prior to 2.0 are not
dnl supported. (2.0 was released on October 16, 2000).
m4_define_default([_AM_PYTHON_INTERPRETER_LIST],
-[python python3 dnl
+[python3 python dnl
python3.20 python3.19 python3.18 python3.17 python3.16 dnl
python3.15 python3.14 python3.13 python3.12 python3.11 python3.10 dnl
python3.9 python3.8 python3.7 python3.6 python3.5 python3.4 python3.3 dnl
--
2.45.2
