Wolfgang Maier <wolfgang.ma...@biologie.uni-freiburg.de> writes: > Dear all, > this is a recurring programming problem that I'm just not sure how to solve > optimally, so I thought I'd ask for your advice: > imagine you have a flag set somewhere earlier in your code, e.g., > > needs_processing = True > > then in a for loop you're processing the elements of an iterable, but the > kind of processing depends on the flag, e.g.,: > > for elem in iterable: > if needs_processing: > pre_process(elem) # reformat elem in place > print(elem) > > this checks the condition every time through the for loop, even though there > is no chance for needs_processing to change inside the loop, which does not > look very efficient.
I bet in most cases you won't notice the time used to check the condition. Beware of premature optimization! -- Piet van Oostrum <p...@vanoostrum.org> WWW: http://pietvanoostrum.com/ PGP key: [8DAE142BE17999C4] -- https://mail.python.org/mailman/listinfo/python-list
