[Tutor] Communicating Between Programs Using Raw Inputs

[Steve Willoughby]

On 14-Jun-11 15:48, Steven D'Aprano wrote:

> Normally you would do this by redirecting standard input. What operating
> system are you using? In Linux, you would do something like:
>
>
> # run script foo.py taking input from the output of bar.py
> foo.py < bar.py

Actually, no, that will send the *source code* of bar.py as the input to 
foo.py.  I think you mean:

bar.py | foo.py

which also should work in DOS as well (although less efficiently).

> However, I don't know if this will actually work for raw_input. It may
> not. Try it and see.

It should.

>
> Perhaps a better way is to have your program accept a user name and
> password on the command line, and only prompt for them if not given.
> Then you can say:
>
> foo.py --user=fred --password="y8Mr3 at hzi"

This is one way.  Another would be to use the subprocess module in 
Python which will let one program invoke another program, and have a 
file-like object on which it can write data, which the child program 
will see as its standard input (and read in to raw_input).

-- 
Steve Willoughby / steve at alchemy.com
"A ship in harbor is safe, but that is not what ships are built for."
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