Thanks Steve I got what you were trying to explain , nice learning from this conversation , what I was really doing wrong I had broken down my huge code into a simple program and had missed out returning False.
On Tue, Nov 29, 2016 at 11:01 AM, Steven D'Aprano < steve+comp.lang.pyt...@pearwood.info> wrote: > On Tuesday 29 November 2016 02:18, Ganesh Pal wrote: > > > On Mon, Nov 28, 2016 at 1:16 PM, Steven D'Aprano < > > steve+comp.lang.pyt...@pearwood.info> wrote: > > > >> > >> > >> There is no need to return True. The function either succeeds, or it > >> raises an > >> exception, so there is no need to return any value at all. > >> > >> > > I returned True here ,because based on the result of this function , > > But the function *always* returns True, or it doesn't return at all: it > raises. > > Unless you have something like: > > def func(): > do some work > if condition: > return False > do more work > return True > > or similar, there's no point. When you write the documentation for the > function, if it can only ever return True, then don't worry about returning > True. Take the built-in methods as an example: dict.update either > succeeds, or > it raises an exception. It doesn't return True: > > # this is unnecessary > flag = mydict.update(another_dict) > if flag: > print "update succeeded" > else: > print "update failed" > > > That cannot happen, because if the update fails, an exception is raised. > > The bottom line is, since your function *only* has "return True" and > doesn't > have "return False" anywhere, there is no point to the "return True." > > > > I would want to perform next steps > > > > Example > > if create_files_append(): > > do_somthing() > > else: > > do_next_thing() > > That cannot happen. It either returns True, or it raises an exception, so > the > "else" clause will not be executed. > > > > > -- > Steven > "Ever since I learned about confirmation bias, I've been seeing > it everywhere." - Jon Ronson > > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
