Python doctest

It is well known, but I wanted to summerize ut for me how to doctest modules:

 import sys,doctest
 
 import somemodule
 
 modules = (somemodule,)
  
 def _test():
     verbose = "-v" in sys.argv
     for mod in modules:
         doctest.testmod(mod, verbose=verbose, report=0)
     doctest.master.summarize()
  
 if __name__ == "__main__":
     _test()