If you develop your own python module it can be useful to reload it each time you make some change. Examples of how to reload a python module:
Reload a module for Python = 3.4 or >
import importlib
importlib.reload(module)
Reload a module for Python >= 3.0 and < 3.4
import imp
imp.reload(module)
Reload a module for Python = 2
reload(module)