looking for IDE advice or workflow tips

[kpierce8 at gmail.com]

I'm a novice developer at best and often work with the R statistical
programming language. I use an editor called TINN-R which allows me to
write a script, then highlight a few lines and send them to the
interpreter. I am using pythonwin and it lacks this funtionality (that
I can tell) and when I copy and paste lines into the interpreter only
the first line is evaluated and the rest appears as returned text.

Is there an editor that allows me to send a few lines out of many
lines of code at a time?

or

How does one check small blocks of code without typing them each time,
running an entire script (with other code) or creating a small script
for every code block?

For example say lines 1-100 work fine and now I'm working on lines
101-105. Should I create a small script with just those lines?

Thanks for any advice