Python-如何从Shell读取stdin并将stdout发送到shell和文件 [英] Python - how can I read stdin from shell, and send stdout to shell and file

问题描述

我想让一个Python脚本从shell(bash)读取stdin，然后将stdout以及重定向文件发送到shell.我尝试了以下方法:

I'd like to have a Python script read stdin from the shell (bash), and send stdout to shell as well a redirected file. I tried the following:

$ cat test.py
#!/usr/bin/python

val = raw_input("enter val: ")
print val

$ ./test.py | tee out
testing
enter val: testing

$ cat out
enter val: testing

由于某种原因，在键入输入后会显示raw_input提示符，这意味着我在键入时看不到该提示符.使用bash脚本，我可以获得与工作类似的东西.

For some reason, the raw_input prompt is printed after I type my input, which means I can't see the prompt as I type. With a bash script, I can get something similar to work.

$ cat test.sh
#!/bin/bash

echo "enter val: "
read val
echo $val

$ ./test.sh | tee out
enter val: testing
testing

$ cat out
enter val: testing

推荐答案

#!/usr/bin/python
import sys

print "enter val: ",
sys.stdout.flush()
val = raw_input()
print val

或

#!/usr/bin/python
import sys

sys.stdout = sys.stderr
val = raw_input("enter val: ")
sys.stdout = sys.__stdout__
print val

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