iterating in reverse
LogiplexSoftware at earthlink.net
Fri Jan 17 20:15:11 CET 2003
On Fri, 2003-01-17 at 10:15, Nick Vargish wrote:
> I just encountered a problem that required reverse iterating to solve,
> and my current solution, though it works, is not so satisfying:
> def commafy(val):
> """Return val as string with commas every thousandth place."""
> val = str(val)
> ret = ''
> c = 0
> for i in range(len(val) - 1, -1, -1):
> if c and not c % 3:
> ret = ',' + ret
> ret = val[i] + ret
> c += 1
> return ret
> This is one of the few times I just haven't been able to come up with
> an elegant and -- dare I say it -- aesthetically pleasing solution in
> Python. I suspect the lack is my own, not Python's.
Here's a variation:
"""Return val as string with commas every thousandth place."""
val = list(str(val))
ret = ''
c = 0
i = val.pop()
if c and not c % 3:
ret = ',' + ret
ret = i + ret
c += 1
Cliff Wells, Software Engineer
Logiplex Corporation (www.logiplex.net)
(503) 978-6726 x308 (800) 735-0555 x308
More information about the Python-list