Tim Hochberg wrote: > Michael Spencer wrote: >> > Robin Becker schrieb: >> >> Is there some smart/fast way to flatten a level one list using the >> >> latest iterator/generator idioms. >> ... >> >> David Murmann wrote: >> > Some functions and timings >> ... > > Here's one more that's quite fast using Psyco, but only average without it. > > > def flatten6(): > n = min(len(xdata), len(ydata)) > result = [None] * (2*n) > for i in xrange(n): > result[2*i] = xdata[i] > result[2*i+1] = ydata[i] > > -tim > Indeed:
I added yours to the list (after adding the appropriate return) >>> testthem() >>> timethem() flatten1(...) 702 iterations, 0.71msec per call flatten2(...) 641 iterations, 0.78msec per call flatten3(...) 346 iterations, 1.45msec per call flatten4(...) 1447 iterations, 345.66usec per call flatten5(...) 1218 iterations, 410.55usec per call flatten6(...) 531 iterations, 0.94msec per call >>> (See earlier post for flatten1-5) Michael -- http://mail.python.org/mailman/listinfo/python-list