Modify dict/set during iteration?

[Steven D'Aprano]

On Thu, 29 Oct 2009 21:14:22 -0700, metal wrote:

> Maybe my real goal is the following:
> 
> def miter(iterable):
> 	for x in tuple(iterable):
> 		if x in iterable:
> 			yield x


I don't think that does what you think it does. For some iterables it 
doesn't do anything at all:

>>> it = iter([1,2,3])
>>> for item in miter(it):
...     print item
...
>>>

and for others it is redundant:

>>> it = [1,2,3]
>>> for item in miter(it):  # same as `for item in it:`
...     print item
...
1
2
3
>>> 


Could you explain what you are trying to accomplish?



-- 
Steven