On Thu, 26 May 2011 23:00:32 -0400, Terry Reedy wrote:
[...]
> To me, that says pretty clearly that start and end have to be
> 'positions', ie, ints or other index types. So I would say that the
> error message is a bug. I see so reason why one would want to use None
> rather that 0 for start or None rather than nothing for end.
def my_string_function(source, x, y, z, start, end):
if source.startswith(x+y+z, start, end):
...
I want sensible defaults for start and end. What should I set them to?
def my_string_function(source, x, y, z, start=0, end=None):
if end is None:
flag = source.startswith(x+y+z, start)
else:
flag = source.startswith(x+y+z, start, end)
if flag:
...
Yuck. Perhaps a better alternative is:
def my_string_function(source, x, y, z, start=0, end=None):
t = (start,) if end is None else (start, end)
if source.startswith(x+y+z, *t):
...
but that's still pretty icky.
--
Steven
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