On Tue, 19 May 2009 14:38:19 -0700, walterbyrd wrote:
> On May 8, 5:55 pm, John Yeung <[email protected]> wrote:
>> On May 8, 3:03 pm,walterbyrd<[email protected]> wrote:
>>
>> > This works, but it seems like there should be a better way.
>>
>> > --------------
>> > week = ['sun','mon','tue','wed','thu','fri','sat'] for day in
>> > week[week.index('tue'):week.index('fri')]:
>> > print day
>> > ---------------
>>
>> I think you should provide much more information, primarily why you
>> want to do this. What is the larger goal you are trying to achieve?
>
> I am just looking for a less verbose, more elegant, way to print a slice
> of a list. What is hard to understand about that? I am not sure how
> enumerated types help.
Printing a slice of a list is about as concise and elegant as possible:
print alist[slice_obj]
or
print alist[start:end:step]
But that's not what the example in your first post suggests. Your example
suggests you have *two* problems:
(1) Given a slice, how to print each item in the slice _individually_.
The answer to that is
for x in aslice:
print x
Pretty concise and elegant.
(2) Given an arbitrary starting and ending _item_ rather than _position_,
how to concisely and elegantly generate a slice.
There are many answers, depending on _why_ you want to do this. One
possible answer is to write a function to do it:
def print_slice(alist, start_item, end_item):
start_pos = alist.index(start_item)
end_pos = alist.index(end_item)
for x in alist[start_pos:end_pos]:
print x
Now print_slice(week, 'tue', 'fri') is pretty concise and elegant.
Another answer is: Don't do that, do something else. If you have an
enumerated type, then you could (in principle) do this:
week = enumerated('mon tue wed thu fri sat sun')
for x in week.tue-week.fri:
print x
depending on the enumerated type itself naturally.
--
Steven
--
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