将 SConstruct 移植到 Python 3

Question

2020 年兼容 Python 3 的最佳实践是什么SConstruct？

例如，运行 oldSConstruct会出现这样的错误。

✗ 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

Answer 1

2to3或者modernize应该有帮助。这只是 Python 语法的问题。2to3随 Python 一起提供，也可以作为 Python 模块执行：python -m lib2to3 -w SConstruct这是建议的补丁2to3，看起来很小：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