Porting SConstruct to Python 3

Question

What is the best practice in 2020 to make SConstruct Python 3 compatible?

For example, running old SConstruct gives errors like this.

✗ python ~/scons/scripts/scons.py scons: Reading SConscript files ... File "/home/techtonik/Folding@home/fah-control/SConstruct", line 17 except Exception, e: ^ SyntaxError: invalid syntax

@Tibebes.M I am using the repo. The problem is that github.com/FoldingAtHome/fah-control repo is not Python 3 compatible, and I don't want to rewrite scripts manually. — anatoly techtonik
– anatoly techtonik, Commented Sep 5, 2020 at 14:32

anatoly techtonik · Accepted Answer · 2020-09-18 04:59:02Z

2to3 or modernize ought to help. it's just Python syntax that's at issue.

2to3 is shipped with Python, and can also be executed as a Python module:

python -m lib2to3 -w SConstruct

Here's the patch 2to3 suggested, looks pretty minor:

RefactoringTool: Refactored SConstruct --- SConstruct (original) +++ SConstruct (refactored) @@ -3,8 +3,8 @@ env = Environment(ENV = os.environ) try: env.Tool('config', toolpath = [os.environ.get('CBANG_HOME')]) -except Exception, e: - raise Exception, 'CBANG_HOME not set?\n' + str(e) +except Exception as e: + raise Exception('CBANG_HOME not set?\n' + str(e)) env.CBLoadTools('packager run_distutils osx fah-client-version') env.CBAddVariables( @@ -14,7 +14,7 @@ # Version try: version = env.FAHClientVersion() -except Exception, e: +except Exception as e: print(e) version = '0.0.0' env.Replace(PACKAGE_VERSION = version) RefactoringTool: Files that need to be modified: RefactoringTool: SConstruct

It's the output of running 2to3 (with a few lines about running other checkers snipped)

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