This could be a very very WIDESPREAD answer...
What exactly do you mean when you say "input from user?"
if you are just talking about a textbox and an okay button then
raw_input('Enter your text')
If you're wanting something a bit more sophisticated and controllable I suggest looking into the Tkinter tools and creating your own GUI where you can create things like combo boxes, checkboxes, entry widgets, popup boxes, and a lot more.
if this doesn't exactly answer what you are asking please post an example of your code then add something like
code code code
#HERE YOU WOULD PUT WHAT YOU WANT TO ACCOMPLISH
code code code