Re: Moving Places, Subtracting from slices/lists
>what does [hotcat[1]] do.? > > > ah, quite simple really, adds roof to the end of hotcat...thanx.. Mark Sargent. -- http://mail.python.org/mailman/listinfo/python-list
Re: Moving Places, Subtracting from slices/lists
Fredrik Lundh wrote:
>Elliot Temple wrote:
>
>
>
>>btw hotcat[:] is a *copy* of hotcat, so just leave out "[:]"
>>
>>
>
>when you want to modify the thing you're looping over, you need
>to be careful. looping over a copy is often a good idea (see the
>Python tutorial and the FAQ for more on this).
>
>
>
Yes, I saw that, and that's why I was using the copy form in the
loop...thanx for verifying this.
>>enumerate is a function that adds indexes to a list. observe:
>>
>>
>
>
>
hotcat = ['roof', 'roof', 'roof']
for index, word in enumerate(hotcat):
if word == 'roof': del hotcat[index]
print hotcat
>['roof']
>
>if I understand the OP correctly, he wants to *move* the "roof" to the
>end of the string.
>
>
correct...
>try:
>hotcat.remove("root")
>hotcat.append("root")
>except ValueError:
>pass
>
>is most likely the fastest way to do that.
>
>
>
>
>
will give it a blast...thanx
>
>
>
Cheers.
Mark Sargent.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Moving Places, Subtracting from slices/lists
Dennis Lee Bieber wrote:
>On Thu, 02 Jun 2005 16:12:44 +0900, Mark Sargent
><[EMAIL PROTECTED]> declaimed the following in
>comp.lang.python:
>
>
>
>>How do I get that x to be an integer b4 it is entered into the indice.?
>>Cheers.
>>
>>
>>
> If you really want the index, ask for the index...
>
>
>
hc
>['Cat', 'roof', 'on', 'a', 'hot', 'tin']
>
>
try:
>...i = hc.index("roof")
>...new_hc = hc[:i] + hc[i+1:] + [hc[i]]
>... except ValueError:
>...pass
>...
>
>
new_hc
>['Cat', 'on', 'a', 'hot', 'tin', 'roof']
>
>
>
Hi All,
ok, got the following for that.
>>> hotcat = ['Cat', 'roof', 'on', 'a', 'hot', 'tin']
>>> i = hotcat.index("roof")
>>> hotcat = hotcat[:1] + hotcat[i+1:] + [hotcat[1]]
>>> except ValueError:
File "", line 1
except ValueError:
^
SyntaxError: invalid syntax
Cheers.
P.S. If it's not too much, could you explain this line.?
hotcat[:1] + hotcat[i+1:] + [hotcat[1]]
hotcat[:1] = Cat?
hotcat[i+1:] = all after roof?
what does [hotcat[1]] do.?
Mark Sargent.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Moving Places, Subtracting from slices/lists
Elliot Temple wrote:
> btw hotcat[:] is a *copy* of hotcat, so just leave out "[:]"
when you want to modify the thing you're looping over, you need
to be careful. looping over a copy is often a good idea (see the
Python tutorial and the FAQ for more on this).
> enumerate is a function that adds indexes to a list. observe:
>>> hotcat = ['roof', 'roof', 'roof']
>>> for index, word in enumerate(hotcat):
>>>if word == 'roof': del hotcat[index]
>>> print hotcat
['roof']
if I understand the OP correctly, he wants to *move* the "roof" to the
end of the string.
try:
hotcat.remove("root")
hotcat.append("root")
except ValueError:
pass
is most likely the fastest way to do that.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Moving Places, Subtracting from slices/lists
On Jun 2, 2005, at 12:12 AM, Mark Sargent wrote: > Hi All, > > getting closer, me thinks. > > hotcat = ['Cat', 'roof', 'on', 'a', 'hot', 'tin'] for x in hotcat[:]: > ... if x == 'roof': hotcat.insert(6,x) > ... del hotcat[x] > ... > Traceback (most recent call last): > File "", line 3, in ? > TypeError: list indices must be integers > > How do I get that x to be an integer b4 it is entered into the > indice.? > Cheers. if you add "print x" to the loop you will see that X is the various words. to get an integer, you could search the list for the index of x. but that's lame. btw hotcat[:] is a *copy* of hotcat, so just leave out "[:]" enumerate is a function that adds indexes to a list. observe: hotcat = ['Cat', 'roof', 'on', 'a', 'hot', 'tin'] for index, word in enumerate(hotcat): if word == 'roof': del hotcat[index] you could also use a list comprehension hotcat = ['Cat', 'roof', 'on', 'a', 'hot', 'tin'] hotcat = [x for x in hotcat if x != 'roof'] -- Elliot Temple http://www.curi.us/ --- [This E-mail scanned for viruses by Declude Virus] -- http://mail.python.org/mailman/listinfo/python-list
Re: Moving Places, Subtracting from slices/lists
Hi All, getting closer, me thinks. >>> hotcat = ['Cat', 'roof', 'on', 'a', 'hot', 'tin'] >>> for x in hotcat[:]: ... if x == 'roof': hotcat.insert(6,x) ... del hotcat[x] ... Traceback (most recent call last): File "", line 3, in ? TypeError: list indices must be integers How do I get that x to be an integer b4 it is entered into the indice.? Cheers. Mark Sargent. -- http://mail.python.org/mailman/listinfo/python-list
Moving Places, Subtracting from slices/lists
Hi All, playing around with the tut now. How can I get this code to remove the original instance of 'roof'.? >>> hotcat = ['Cat', 'roof', 'on', 'a', 'hot', 'tin'] >>> for x in hotcat[:]: ... if x == 'roof': hotcat.insert(6,x) ... >>> hotcat ['Cat', 'roof', 'on', 'a', 'hot', 'tin', 'roof'] Perhaps a replace or something after the 2nd line of the for function.? >>> hotcat = ['Cat', 'roof', 'on', 'a', 'hot', 'tin'] >>> for x in hotcat[:]: ... if x == 'roof': hotcat.insert(6,x) ... hotcat[x:len(x)] = [] ... Traceback (most recent call last): File "", line 3, in ? TypeError: slice indices must be integers I feel I'm close to it. Cheers. Mark Sargent. -- http://mail.python.org/mailman/listinfo/python-list
