How make function to run a shell command ON BUFFER??

[Yehudah Rubinsky <edrubins@andisplace.com>]

 >pychecker is a function that checks Python code.. e.g.
 >pychecker myprogram.py

 >How make an Emacs function to run pychecker on buffer???
 >I guess function will have to run a shell command with the 1 and only
 >argument being the name of buffer.

Pyhton mode's Ctl-c Ctl-c runs the python interpreter against the buffer. 
The good new is this will check the syntax of the python code, including 
the use of C-x` to step to each error in turn. The bad news is that it will 
actually  run the python code, which may have undesirable side effects.

Best,
Yehudah Rubinsky