Why doesn't Eclipse recognize the edited program and execute the previous program?

Question

Python

I immediately apologize for the incomprehensible wording of the question.
I am writing a small website in Python/Bottle. If you run the program in IDLE or Geany, it runs fine. And on Eclipse Kepler, the same program is executed after editing and saving. For example, I open eclipse, write code, run it, it works fine. I am editing the same program, but the first version of the program is running. After a while it works fine again. Then again repeats the same result. (To be sure, I changed the programs so that the results of the change were huge)
What should I do? How to make it run differently every time?

Answer 1

Apparently, automatic rebuilding is disabled, and eclip runs the latest explicitly built version.
To update, you must either explicitly rebuild the program, or enable the option to automatically rebuild on changes (Build - Build Automaticaly)