我不知道你为什么需要这样做，但你总是可以这样做:

I'm not sure why you would need to, but you could always do this:

a = raw_input("Type something: ")
if sys.stdin is not sys.__stdin__:
    print(a)
print("You typed in: "+a)

再说一次，根据需要将 raw_input 替换为您自己的实现可能更有意义.

Then again, swapping raw_input for your own implementation as needed would probably make more sense.

好的，根据您的评论，您似乎想要进行一些猴子修补.像这样:

okay, based on your, comment it looks like you'll want to do some monkey patching. Something like this:

old_raw_input = raw_input

def new_raw_input(prompt):
    result = old_raw_input(prompt)
    if sys.stdin is not sys.__stdin__:
        print result
    return result

raw_input = new_raw_input

当然，这可能会使重定向 stdin 没有实际意义.

Of course, this might make the point of redirecting stdin moot.