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.pyscons: 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