python - 使 python 3 异常向后兼容

Question

此代码块(来自 PEP 3109)的向后(2.6，如果可能)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 中的表现一样接近:

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