使python3异常向后兼容

Question

此代码块（来自PEP 3109）的向后（如果可能，为2.6）兼容语法是什么：

try:
   self.spawn(pp_args)
except DistutilsExecError as msg:
   raise CompileError from msg

Answer 1

这与您在python-2.x中看到的非常接近：

try:
   self.spawn(pp_args)
except DistutilsExecError as msg:
    print "DistutilsExecError : " + str(DistutilsExecError(msg))
    print
    print "The above exception was the direct cause of the following exception:"
    raise CompileError