James Stroud wrote:
> Steven D'Aprano wrote:
>> If I want to iterate over part of the list, the normal Python idiom is to
>> do something like this:
>>>> alist = range(50)
>> # first item is special
>> x = alist[0]
>> # iterate over the rest of the list
>> for item in alist[1:]
>> x = item
>>>> The important thing to notice is that alist[1:] makes a copy. What if the
>> list has millions of items and duplicating it is expensive? What do
>> people
>> do in that case?
>>>> Are there better or more Pythonic alternatives to this obvious C-like
>> idiom?
>>>> for i in range(1, len(alist)):
>> x = alist[i]
>>>>>> I think this is a job for iterators:
>> listiter = iter(alist)
>> first_item_is_special = listiter.next()
>> for not_special_item in listiter:
> do_stuff_with(not_special_item)
>>> Other solutions might involve enumerators:
>> special = [i for i in xrange(50) if not i%13]
>> for i,item in alist:
> if i in special:
> do_something_special_with(item)
> else:
> do_other_stuff_with(item)
>> James
>>> James
I mean
for i,item in enumerate(alist):
