Re: [Tutor] A simple list question...
> 1. How can I easily strip out the newline characters from the > elements > of cleanedlist? You can use the string strip() method. > 2. Is there a better way to achieve my objective (ie. a list method > for generating the cleaned list?) You can convert the list to a Set. >>> L = [1,2,1,3,4,2] >>> s = set(L) >>> s set([1, 2, 3, 4]) >>> HTH, Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A simple list question...
On 9/7/06, Kent Johnson <[EMAIL PROTECTED]> wrote: > No, it doesn't. You are confused somewhere; my guess is your original > data has newlines. Sorry, my bad. When I created the original list I was splitting a string in two pieces. The latter portion of the string had a newline at the end. I had taken the slice with [index:] instead of [index:-1]. Thanks for the help and the tips regarding other ways to do it. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A simple list question...
On 08/09/06, Richard Querin <[EMAIL PROTECTED]> wrote:
> I've got a list of strings. There are some duplicates. I want a list
> of only the unique entries in that list. So I do the following:
>
> mylist = ['project1' , 'project2', 'project3', 'project4', 'project1']
>
> d = {}
>
> for item in mylist:
>d[item] = None
>
> cleanedlist = d.keys()
>
> But d.keys() seems to add '\n' to each entry in cleanedlist.
Um. I'm not in a position to test your code right now, but I can't
think of any reason why it would do that..
> 1. How can I easily strip out the newline characters from the elements
> of cleanedlist?
You could do [s.strip() for s in cleanedlist] -- the .strip() string
method will strip whitespace from both ends of the string.
> 2. Is there a better way to achieve my objective (ie. a list method
> for generating the cleaned list?)
cleanedlist = list(set(mylist))
If you don't have python 2.4+, you will need to import the sets module.
Also, depending on what you are doing with cleanedlist, you could just
leave it as a set. Or even construct mylist as a set.
--
John.
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Re: [Tutor] A simple list question...
Richard Querin wrote:
> I've got a list of strings. There are some duplicates. I want a list
> of only the unique entries in that list. So I do the following:
>
> mylist = ['project1' , 'project2', 'project3', 'project4', 'project1']
>
> d = {}
>
> for item in mylist:
> d[item] = None
>
> cleanedlist = d.keys()
>
>
> But d.keys() seems to add '\n' to each entry in cleanedlist.
No, it doesn't. You are confused somewhere; my guess is your original
data has newlines. Using your code above exactly:
In [1]: mylist = ['project1' , 'project2', 'project3', 'project4',
'project1']
In [2]: d = {}
In [3]: for item in mylist:
...: d[item] = None
...:
In [4]: cleanedlist = d.keys()
In [5]: cleanedlist
Out[5]: ['project4', 'project1', 'project3', 'project2']
No newlines here.
> 2. Is there a better way to achieve my objective (ie. a list method
> for generating the cleaned list?)
If you don't care about the order of items in the new list, just convert
to a set and back (essentially a more concise version of what you did
with a dict):
In [6]: list(set(mylist))
Out[6]: ['project4', 'project1', 'project3', 'project2']
Kent
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[Tutor] A simple list question...
I've got a list of strings. There are some duplicates. I want a list
of only the unique entries in that list. So I do the following:
mylist = ['project1' , 'project2', 'project3', 'project4', 'project1']
d = {}
for item in mylist:
d[item] = None
cleanedlist = d.keys()
But d.keys() seems to add '\n' to each entry in cleanedlist.
1. How can I easily strip out the newline characters from the elements
of cleanedlist?
2. Is there a better way to achieve my objective (ie. a list method
for generating the cleaned list?)
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