How to implement the --verbose or -v option into a script?

Question

I know the --verbose or -v from several tools and I\'d like to implement this into some of my own scripts and tools.

I thought of placing:<

Answer 1

I stole the logging code from virtualenv for a project of mine. Look in main() of virtualenv.py to see how it's initialized. The code is sprinkled with logger.notify(), logger.info(), logger.warn(), and the like. Which methods actually emit output is determined by whether virtualenv was invoked with -v, -vv, -vvv, or -q.