Steven D'Aprano <[EMAIL PROTECTED]> writes:
> for i in range(1, len(alist)):
> x = alist[i]
a2 = iter(alist)
a2.next() # throw away first element
for x in a2:
...
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Steven D'Aprano <[EMAIL PROTECTED]> wrote:
> 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?
I think you are worrying prematurely.
On my system slicing one element off the fr
Steven D'Aprano wrote:
> Are there better or more Pythonic alternatives to this obvious C-like
> idiom?
>
> for i in range(1, len(alist)):
> x = alist[i]
For small start values you can use itertools.islice(), e. g:
for x in islice(alist, 1, None):
# use x
You'd have to time at what poi
Steven D'Aprano wrote:
[snip]
> 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 r
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
>>
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 notic
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
