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Pipes and tooltips in Python CLI scripts

Is it possible to combine incoming requests and TTY requests in Python CLI scripts? For example, do the following:

import sys

piped_text = None

if not sys.stdin.isatty():
    piped_text = sys.stdin.read()

user_in = raw_input('Enter something: ')

if piped_text:
    sys.stdout.write(piped_text)

sys.stdout.write(user_in + '\n')

It produces the following output:

~: python mrprompt.py
Enter something: something
something
~: echo foo | python mrprompt.py
Enter something: Traceback (most recent call last):
  File "mrprompt.py", line 9, in <module>
    user_in = raw_input('Enter something: ')
EOFError: EOF when reading a line

When the output I'm looking for is the following:

~: python mrprompt.py
Enter something: something
something
~: echo foo | python mrprompt.py
Enter something: something
foo
something

I suppose, in other words, is it possible for a subshell to know the tty of its parent shell? Is it possible in Python to interact with the tty parent shell? I use bash inside the GNU screen (so reading the environment variable "SSH_TTY" is not a viable option).

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3 answers

This works, more or less:

#!/usr/bin/python

import sys

saved_stdin = sys.stdin
sys.stdin = open('/dev/tty', 'r')
result = raw_input('Enter something: ')
sys.stdout.write('Got: ' + result + '\n')
sys.stdin = saved_stdin
result2 = sys.stdin.read()
sys.stdout.write('Also got: ' + result2)

Save as foo.pyand tryecho goodbye | ./foo.py

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