I get an error in my python app on GAE (in my localhost) saying:
variable xyz in line 23 expects string.... bool given --- SUPPOSE
Now, to fix that error i remove the entire line 23 and, thus, there is no variable called xyz in my script anymore. (I used ctrl+F to find xyz and i ensured there is no xyz in my script). 
Then i hit refresh on the browser and even then i get the exactly same error again.
variable xyz in line 23 expects string.... bool given --- meaning the code changes from my editor have not taken any effect in the GAE runtime, i suppose.
I refreshed the page several times... I gave the chrome browser some time... I refreshed the page again... no luck. Then I noticed that the code changes took effect ONLY WHEN I stopped and re-ran the python app from the GAE launcher.
Now, having to do this every time i updated the code is a pain. How do i fix this literal chaos? GAE just got updated on my Mac OS X 10.7.5 a few days ago.