running a shell command from a python program

[Sandman]

Hi,
   I'm a newbie, so please be gentle :-)

How would I run a shell command in Python?

Here is what I want to do:
I want to run a shell command that outputs some stuff, save it into a
list and do stuff with the contents of that list.

I started with a BASH script actually, until I realized I really needed
better data structures :-)

Is popen the answer? Also, where online would I get access to good
sample code that I could peruse?

I'm running 2.2.3 on Linux, and going strictly by online doc so far.

Thanks!
S C

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Re: running a shell command from a python program

[Sandman]

Doh, use the search Luke:

http://www.wellho.net/forum/Programming-in-Python-and-Ruby/Running-shell-commands-from-Python.html

Seems like popen is the way to go.

S

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looking up dictionaries by values

[Sandman]

Hi there,
  I'm still a bit new to Python, and had a question.
I have a dictionary that looks like:
PWD = \
  {
   "root": 0,
   "joe": 200,
   "susan":   201,
..
}

  In other words, the values are unique as well as the keys. I've run
into a situation where I need to lookup the item by value. So given
201, I need to say the key is really susan.

 Is there a way to do this that does not traverse the entire dictionary
multiple times?

Thanks.

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Re: tutorial

[Sandman]

I'm a beginner as well, and I liked this one:

http://docs.python.org/tut/tut.html

But I ended up buying the "Learning Python" book anyway.

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