[Python] when to use decorator and decorator factory?

This is a bit confusing: a decorator takes no arguments, while a decorator factory takes arguments and still returns a decorator that decorates a function.

A description of when to use each would be helpful.

Edit: The confusion comes from the following example:

def before_run(func):
print "hello from before run"
def handle_arg(a,b):
if(a>0):
a= 100
return func(a,b)

return handle_arg

@before_run
def running_func(a,b):
print "a",a,"b", b
return a+b


Edit: Is there a way to do this using decorator factory by adding logging option(true or false)?

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