Lucas P Melo wrote:
> Hello,
> I would like to know how much it costs to insert an element into a list
> using this operation:
> a[2:2] = [ 1 ]
> i. e, what is the complexity of the operation above (given that len(a) =
> n)?
O(n) I'd say. You need to copy nearly the whole list, and sometimes
re-a
Robert Kern wrote:
O(n). Python lists are contiguous arrays in memory, and everything
after the insertion point needs to be moved. Raymond Hettinger has a
good talk about the implementation of Python lists and other container
objects.
http://www.youtube.com/watch?v=hYUsssClE94
http://www.pyco
On 2009-07-21 14:21, Lucas P Melo wrote:
Hello,
I would like to know how much it costs to insert an element into a list
using this operation:
a[2:2] = [ 1 ]
i. e, what is the complexity of the operation above (given that len(a) =
n)?
O(n). Python lists are contiguous arrays in memory, and every
On Tue, Jul 21, 2009 at 2:21 PM, Lucas P Melo wrote:
> I would like to know how much it costs to insert an element into a list
> using this operation:
> a[2:2] = [ 1 ]
> i. e, what is the complexity of the operation above (given that len(a) =
> n)?
>
O(n)
If you want O(log n), you can use the b
Hello,
I would like to know how much it costs to insert an element into a list
using this operation:
a[2:2] = [ 1 ]
i. e, what is the complexity of the operation above (given that len(a) = n)?
Thanks.
--
http://mail.python.org/mailman/listinfo/python-list
[EMAIL PROTECTED] writes:
> hi
> i have a list (after reading from a file), say
> data = [ 'a','b','c','d','a','b','e','d']
>
> I wanted to insert a word after every 'a', and before every 'd'. so i
> use enumerate this list:
> for num,item in enumerate(data):
> if "a" in item:
> data.in
On Apr 16, 6:05 pm, [EMAIL PROTECTED] wrote:
> hi
> i have a list (after reading from a file), say
> data = [ 'a','b','c','d','a','b','e','d']
>
> I wanted to insert a word after every 'a', and before every 'd'. so i
> use enumerate this list:
> for num,item in enumerate(data):
> if "a" in item
On Apr 17, 9:47 am, Michael Hoffman <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> > hi
> > i have a list (after reading from a file), say
> > data = [ 'a','b','c','d','a','b','e','d']
>
> > I wanted to insert a word after every 'a', and before every 'd'. so i
> > use enumerate this list:
[EMAIL PROTECTED] wrote:
> hi
> i have a list (after reading from a file), say
> data = [ 'a','b','c','d','a','b','e','d']
>
> I wanted to insert a word after every 'a', and before every 'd'. so i
> use enumerate this list:
> for num,item in enumerate(data):
> if "a" in item:
> data.inse
hi
i have a list (after reading from a file), say
data = [ 'a','b','c','d','a','b','e','d']
I wanted to insert a word after every 'a', and before every 'd'. so i
use enumerate this list:
for num,item in enumerate(data):
if "a" in item:
data.insert(num+1,"aword")
if "d" in item:
>>hold = self.next
>>self.next = DaClass(value)
>>self.next.next = hold
>>
>> but i suspect (from print statement insertions) that the result
>> is not as i expect. as the concept and code should be very
>> common, as i am too old for pride, i thought i would ask.
> I think you're fine
On Tue, 23 Aug 2005 20:58:11 -0700, Randy Bush <[EMAIL PROTECTED]> wrote:
>i am trying to insert into a singly linked list
>
>hold = self.next
>self.next = DaClass(value)
>self.next.next = hold
>
>but i suspect (from print statement insertions) that the result
>is not as i expect. as
>> hold = self.next
>> self.next = DaClass(value)
>> self.next.next = hold
> shouldn't that last line be this?
> self.next.prev = hold
single threaded list
> What did you expect, and what did you ovserve?
i will try to distill a case
randy
--
http://mail.python.org/mailman/l
On Tue, 23 Aug 2005 20:58:11 -0700, Randy Bush wrote:
> i am trying to insert into a singly linked list
>
> hold = self.next
> self.next = DaClass(value)
> self.next.next = hold
>
> but i suspect (from print statement insertions) that the result
> is not as i expect. as the concept
Randy Bush enlightened us with:
> hold = self.next
> self.next = DaClass(value)
> self.next.next = hold
shouldn't that last line be this?
self.next.prev = hold
> but i suspect (from print statement insertions) that the result is
> not as i expect.
What did you expect, and wha
What you've posted looks right, more or less.
To get any sort of meaningful feedback, you really need to post a full
version of your code, including the print statements, what's being
printed, and why you think this shows the code is not working. What
you've shown is far too little for anybody els
i am trying to insert into a singly linked list
hold = self.next
self.next = DaClass(value)
self.next.next = hold
but i suspect (from print statement insertions) that the result
is not as i expect. as the concept and code should be very
common, as i am too old for pride, i thought i
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