On Wed, 30 Sep 2015 07:07 am, Ian Kelly wrote: > On Tue, Sep 29, 2015 at 3:04 PM, Random832 <random...@fastmail.com> wrote: >> How about x not in range(11)? > > That's fine as long as x is known to only take integral values.
It's not fine. In Python 2, it's painfully slow and inefficient, both memory-wise and algorithmically: -1 in range(100000000) # test 0 <= -1 <= 100000000 This first creates a list of 100000000 integers, then compares each and every one of them against -1 before returning False. Using xrange instead at least avoids building the list first, but it still compares -1 against each value. Testing a numeric value within a certain range of values should be constant time and constant memory. It should be *fast*. Using range in Python 2 is none of those things. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
