[EMAIL PROTECTED] wrote: > On 18 juil, 13:13, Peter Otten <[EMAIL PROTECTED]> wrote: >> [EMAIL PROTECTED] wrote: >> > In fact, 'any(myobject is element for element in mylist)' is 2 times >> > slower than using a for loop, and 'id(myobject) in (id(element) for >> > element in mylist)' is 2.4 times slower. >> >> This is not a meaningful statement unless you at least qualify with the >> number of item that are actually checked. For sufficently long sequences >> both any() and the for loop take roughly the same amount of time over >> here. >> > > Sorry. I used short lists (a list of 20 floats) and the element > checked was not in the list. > (That was the case I usually deals with in my code.)
What is your (concrete) use case, by the way? If you want efficiency you should use a dictionary instead of the list anyway: $ python -m timeit -s"d=dict((id(i), i) for i in range(1000)); x = 1000" "id(x) in d" 1000000 loops, best of 3: 0.275 usec per loop Peter -- http://mail.python.org/mailman/listinfo/python-list
