[Python-ideas] Default return values to int and float

[Ethan Furman]

Ron Adam wrote:
> On Wed, 2011-10-05 at 19:08 +1300, Greg Ewing wrote:
>> Guido van Rossum wrote:
>>
>>> I'm out of ideas here. But of all these, str.find is probably still
>>> the worst -- I've flagged bugs caused by it too many times to count.
>> Could a with-statement be used here somehow?
>>
>>      with finding(x, s) as i:
>>          ...
> 
> Or an iterator.
> 
>      for i in finding(x, s):
>           ...

How would the case of not found be handled in either of these proposals?

     with finding(x, s) as i:
         ...
     if not i:  # same problem as str.find, unless i is not a simple int


     for i in finding(x, s):
         ...
     else:
         # unless for loop has a break, this will happen...
         # not a problem until you want more than just the first
         # occurrence of s in x


~Ethan~