无法运行 scons 并出现导入错误

我已经安装了 scons 2.3.2 并安装了 python 2.4。

当我运行 scons 时，我看到以下错误：

scons
Import failed. Unable to find SCons files in:
  /usr/bin/../engine
  /usr/bin/scons-local-2.3.2
  /usr/bin/scons-local
  /usr/lib/scons-2.3.2
  /usr/lib/scons-2.3.2
  /usr/local/lib/scons-2.3.2
  /usr/lib/python2.4/site-packages/scons-2.3.2
  /usr/lib/python2.4/site-packages/scons-2.3.2
  /usr/local/lib/python2.4/site-packages/scons-2.3.2
  /usr/lib64/scons-2.3.2
  /usr/lib/scons
  /usr/lib/scons
  /usr/local/lib/scons
  /usr/lib/python2.4/site-packages/scons
  /usr/lib/python2.4/site-packages/scons
  /usr/local/lib/python2.4/site-packages/scons
  /usr/lib64/scons
Traceback (most recent call last):
  File "/usr/bin/scons", line 190, in ?
    import SCons.Script
  File "/usr/lib/scons/SCons/Script/__init__.py", line 76, in ?
    import SCons.Environment
  File "/usr/lib/scons/SCons/Environment.py", line 48, in ?
    import SCons.Defaults
  File "/usr/lib/scons/SCons/Defaults.py", line 52, in ?
    import SCons.Tool
  File "/usr/lib/scons/SCons/Tool/__init__.py", line 50, in ?
    import SCons.Scanner.C
  File "/usr/lib/scons/SCons/Scanner/C.py", line 36, in ?
    import SCons.cpp
  File "/usr/lib/scons/SCons/cpp.py", line 398
    p = self.stack[-1] if self.stack else self.default_table
                        ^
SyntaxError: invalid syntax

我做了一个查找，发现 SCons 存在于 /usr/lib/scons 中。我不知道为什么 scons 无法拾取它。

我缺少什么？

问题（从回溯的底部）是语法错误：

    p = self.stack[-1] if self.stack else self.default_table
                        ^
SyntaxError: invalid syntax

这是因为您运行的 Python 版本不支持条件表达式：

2.5 中添加了对此语法的支持，请参阅the docs https://docs.python.org/2/reference/expressions.html#conditional-expressions