Kay Schluehr wrote: > Instead of writing f(g(h(...))) it is sometimes adaequate to write > > x = h(...) > f(g(x)) > > I use this a lot in particular in C++. Optimzing compilers eliminate > runtime penalties. This is of course different in CPython.
if "x" is a local variable, the penality isn't that huge: $ timeit "id(len(str(0)))" 1000000 loops, best of 3: 0.911 usec per loop $ timeit "x = str(0); id(len(x))" 1000000 loops, best of 3: 0.968 usec per loop globals are slower: $ timeit -s "global x" "x = str(0); id(len(x))" 1000000 loops, best of 3: 1.26 usec per loop </F> -- http://mail.python.org/mailman/listinfo/python-list
