Re: [Tutor] rstrip in list? (SOLVED)
There was so many different solutions presented here to me.
Thanks to all. By adding '.strip('\n') to the last two lines below, it
came out:
Sorted List
['102', '231', '463', '487', '555', '961']
for line in file.readlines():
print line.strip('\n'),
mylist.append(line.strip('\n'))
Further work and studying needed here. LOL.
Ken
Steven D'Aprano wrote:
On Wed, 10 Feb 2010 02:28:43 am Ken G. wrote:
I printed out some random numbers to a list and use 'print mylist'
and they came out like this:
['102\n', '231\n', '463\n', '487\n', '555\n', '961\n']
I was using 'print mylist.rstrip()' to strip off the '\n'
but kept getting an error of :
AttributeError: 'list' object has no attribute 'rstrip'
You have to apply rstrip to each item in the list, not the list itself.
Here are two ways to do it:
#1: modify the list in a for-loop
for i, item in enumerate(mylist):
mylist[i] = item.rstrip()
#2: make a new list with a list comprehension
mylist = [item.rstrip() for item in mylist]
Of the two, I prefer the second.
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Re: [Tutor] rstrip in list?
On Tue, Feb 9, 2010 at 11:09 AM, Ken G. wrote: > > Kent Johnson wrote: > > On Tue, Feb 9, 2010 at 10:28 AM, Ken G. wrote: > > > I printed out some random numbers to a datafile and use 'print mylist' and > they came out like this: > > ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n'] > > > How are you generating this list? You should be able to create it > without the \n. That would be better than stripping them out. > > > I inputting some random numbers into a database and then created a list > and appended the list as it read the database. If you show the code for this perhaps we can figure out where the newlines are coming from. Kent ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] rstrip in list?
-Original Message-
From: tutor-bounces+bermanrl=cfl.rr@python.org
[mailto:tutor-bounces+bermanrl=cfl.rr@python.org] On Behalf Of Ken G.
Sent: Tuesday, February 09, 2010 10:29 AM
To: tutor@python.org
Subject: [Tutor] rstrip in list?
I printed out some random numbers to a list and use 'print mylist' and
they came out like this:
['102\n', '231\n', '463\n', '487\n', '555\n', '961\n']
I was using 'print mylist.rstrip()' to strip off the '\n'
but kept getting an error of :
AttributeError: 'list' object has no attribute 'rstrip'
My memory must be hazy but I thought I had it working several months ago.
Any idea or suggestion?
TIA, Ken
In [14]: mylist
Out[14]: ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n']
In [15]: for item in mylist:
: print item.strip('\n')
:
:
102
231
463
487
555
961
I get the impression you can strip something from the elements in the list,
but that it balks at a change to the entire list in a single statement?
Robert
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Re: [Tutor] rstrip in list?
Ken G. wrote: I printed out some random numbers to a list and use 'print mylist' and they came out like this: ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n'] I was using 'print mylist.rstrip()' to strip off the '\n' but kept getting an error of : AttributeError: 'list' object has no attribute 'rstrip' rstrip is a string method, not a list method. You must apply it to each element in the list. One way is: print [item.rstrip() for iten in mylist] -- Bob Gailer 919-636-4239 Chapel Hill NC ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] rstrip in list?
Kent Johnson wrote: On Tue, Feb 9, 2010 at 10:28 AM, Ken G. wrote: I printed out some random numbers to a datafile and use 'print mylist' and they came out like this: ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n'] How are you generating this list? You should be able to create it without the \n. That would be better than stripping them out. I inputting some random numbers into a database and then created a list and appended the list as it read the database. I was using 'print mylist.rstrip()' to strip off the '\n' but kept getting an error of : AttributeError: 'list' object has no attribute 'rstrip' My memory must be hazy but I thought I had it working several months ago. Any idea or suggestion? Use a list comprehension or map(): In [1]: l = ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n'] In [2]: [ i.rstrip() for i in l ] Out[2]: ['102', '231', '463', '487', '555', '961'] In [3]: map(str.rstrip, l) Out[3]: ['102', '231', '463', '487', '555', '961'] Kent My database file has numbers of the same exact length that need to be sorted. I am using 'mylist.sort()' as one of the command. Actually, I will be using 'mylist.reverse' after that command. I am still in a learning mode. Thanks. Ken ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] rstrip in list?
On Tuesday 09 February 2010 16:28:43 Ken G. wrote:
> ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n']
>
> I was using 'print mylist.rstrip()' to strip off the '\n'
>
> but kept getting an error of :
>
> AttributeError: 'list' object has no attribute 'rstrip'
A string has attribute rstrip not a list.
You will need to loop over the list and update each item of the list with
rstrip(). This, mylist = [s.rstrip('\n') for s in mylist], should do it.
It might be that before making the list you did rstrip() on the individual
strings..?
Greets
Sander
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Re: [Tutor] rstrip in list?
On Wed, 10 Feb 2010 02:28:43 am Ken G. wrote: > I printed out some random numbers to a list and use 'print mylist' > and they came out like this: > > ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n'] > > I was using 'print mylist.rstrip()' to strip off the '\n' > > but kept getting an error of : > > AttributeError: 'list' object has no attribute 'rstrip' You have to apply rstrip to each item in the list, not the list itself. Here are two ways to do it: #1: modify the list in a for-loop for i, item in enumerate(mylist): mylist[i] = item.rstrip() #2: make a new list with a list comprehension mylist = [item.rstrip() for item in mylist] Of the two, I prefer the second. -- Steven D'Aprano ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] rstrip in list?
On Tue, Feb 9, 2010 at 10:28 AM, Ken G. wrote: > I printed out some random numbers to a list and use 'print mylist' and > they came out like this: > > ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n'] How are you generating this list? You should be able to create it without the \n. That would be better than stripping them out. > I was using 'print mylist.rstrip()' to strip off the '\n' > > but kept getting an error of : > > AttributeError: 'list' object has no attribute 'rstrip' > > My memory must be hazy but I thought I had it working several months ago. > > Any idea or suggestion? Use a list comprehension or map(): In [1]: l = ['102\n', '231\n', '463\n', '487\n', '555\n', '961\n'] In [2]: [ i.rstrip() for i in l ] Out[2]: ['102', '231', '463', '487', '555', '961'] In [3]: map(str.rstrip, l) Out[3]: ['102', '231', '463', '487', '555', '961'] Kent ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
