Countdown

[Tim Hochberg]

Jeff Sandys <sandysj at asme.org> writes:

> Python is really elegant when counting up:
> 
> for i in range(len(thing)):
>     print thing[i]
> 
> But when counting down looks ugly:
> 
> for j in range(len(thing)-1,-1,-1):
>     print thing[i]
> 
> Advice so far:
> Stop doing things backwards:
>     (customer request)
> Use reverse first:
>     (destructive, need to unreverse after)
> Live with it:
>     (bytecode doesn't care, but it is still ugly)
> Try range(len(thing)).reverse():
>     (doesn't work but):
>         rthing = range(len(thing))
>         rthing.reverse()
>         for k in rthing:
>             print thing[i]
>     (works, but also ugly)


This is completely overkill for this, but you could get Numeric and use:

from Numeric import arange
for j in arange(len(thing))[::-1]:
    print thing[j]

-tim