Reading From stdin After Command Line Redirection

[Tim Daneliuk]

I have a program that runs like this:

   foo.py <inputfile

I want to reconnect stdin to the tty as usual after 'inputfile'
has been read so that things like raw_input and getpass
will work as expected.

So, after I do .... = sys.stdin.readlines(), how to I reopen
stdin in its nonredirected mode?
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Tim Daneliuk