since you are using python 2.7 presumably, you need to include 'reload' to ensure that they are reloaded during development
add the line
import blah #your import tools/modules line
reload(blah) # reload them during the development stage and you can comment it out later
2. Built-in Functions — Python 2.7.12rc1 documentation
In any event, once a module is imported, then it won't automatically reload once it is loaded unlessed forced.
There are fancier ways, but this is easiest to remember. Things change in python 3.4.x
26.6. 2to3 - Automated Python 2 to 3 code translation — Python 3.4.5rc1 documentation
fixes Converts reload() to imp.reload().
