How to run python script in emacs

[devilkin]

I'm just starting learning python, and coding in emacs. I usually
split emacs window into two, coding in one, and run script in the
other, which is not very convenient. anyone can help me with it? is
there any tricks like emacs short cut?

also please recommand some emacs plug-ins for python programming, i'm
also beginner in emacs.currently i'm only using python.el. Are any
plugins supply code folding and autocomplete?

BTW, I'm not a english native speaker, any grammer mistakes, please
correct them. :)