variabe substitution in python?

[fadder]

Hi,

I'm trying to learn python, starting from a perl background. I'd like to do the
equivalent to the following perl code:


foreach $i ( 23, 45, 67 ) {
open(IN,"<file$i.dat");
or,
system(" do-something-with-$i ")
}

So that $i is replaced by relevent numbers. I know that in python I could do something
like f="file%d.dat" % i and then open that file on another line, but is there a way
to do this in-place? I am so used to perl's usage where I can subtitute anything anywhere i a string.

Thanks for any tips.

[JDahl]

for i in [10,20,30]:
f = open('file%i.txt'%i)

[fadder]

Ooops, I'm embarassed it was that simple. I'm sure I had tried similar thngs and got stuck, but can't think of an example just now.

Thanks!