File object wrapper for a String?

[David Erickson]

I am using the Popen class from subprocess and would like to feed a
string in as the stdin parameter, however primarily it only takes a
File object. Does there exist a wrapper for a string to do this? I
know I can just dump the string to a temp file and feed that in but
that is pretty hacky.

Thanks,
David

 

[Christian Heimes]

I am using the Popen class from subprocess and would like to feed a
string in as the stdin parameter, however primarily it only takes a
File object. Does there exist a wrapper for a string to do this? I
know I can just dump the string to a temp file and feed that in but
that is pretty hacky.

You don't need a file like object:

popen = subprocess.Popen(..., stdin=subprocess.PIPE)
popen.stdin.write("yourstring")

Christian

 

[Diez B. Roggisch]

I am using the Popen class from subprocess and would like to feed a
string in as the stdin parameter, however primarily it only takes a
File object. Does there exist a wrapper for a string to do this? I
know I can just dump the string to a temp file and feed that in but
that is pretty hacky.

Christian told you how to work with popen. Just for the record thogh:
there are the StringIO and cStringIO-modules.

Diez

 

[Christian Heimes]

Christian told you how to work with popen. Just for the record thogh:
there are the StringIO and cStringIO-modules.

IIRC subprocess requires a real file with a file descriptor for the
standard streams. An object with a write or read method isn't enough.

Christian

 

[David Erickson]

You don't need a file like object:

popen = subprocess.Popen(..., stdin=subprocess.PIPE)
popen.stdin.write("yourstring")

Christian

Perfect. Thanks.

-David

 

[David Erickson]

Christian told you how to work with popen. Just for the record thogh:
there are the StringIO and cStringIO-modules.

Diez

Good to know, thanks Diez.

-David