how can I find out the process ids with a process name

[herman]

Hi,

I would like to find out all the process id with the process name
'emacs'.

In the shell, i can do this:

$ ps -ef |grep emacs
root     20731  8690  0 12:37 pts/2    00:00:09 emacs-snapshot-gtk
root  25649 25357  0 13:55 pts/9    00:00:05 emacs-snapshot-gtk rtp.c
root  26319 23926  0 14:06 pts/7    00:00:04 emacs-snapshot-gtk
stressTestVideo.py
root  26985     1  0 14:15 ?        00:00:01 /usr/bin/emacs-snapshot-
gtk
root     27472 21066  0 14:23 pts/5    00:00:00 grep emacs


and I can see the process id is 20731, 25649, etc, etc.

But now I would like to do the programmically in my python script.
I know I can use ' os.system(cmd)' to execute the command 'ps -ef |
grep emacs', but how
can I pipe the output of my 'ps -ef | grep emacs' to my python script
and then run a regression expression with it to get the process Ids?

Thank you.