Stripping parts of a path

**Larry Bates** · Jul 26 '08, 02:05 PM

Re: Stripping parts of a path

Tim Cook wrote:

Hi All,
>
I just ran into an issue with the rstrip method when using it on path
strings.
>
When executing a function I have a need to strip off a portion of the
current working directory and add on a path to a log file. Initially
this worked great but then I added a branch in SVN which caused the path
to contain 'LNCCWorkshop'. The rstrip() then began removing the
characters 'shop' leaving an incorrect path to the log file. When I
hard coded this path it worked okay but then did the same thing later in
the file when I needed to point to a database. The code worked fine with
a different path. Here are some code fragments.
>
logfile=os.getc wd().rstrip('sr c/oship/atbldr')+'/oship/log/at_build_errors .log'
>
this worked when the path was:
/home/tim/ref_impl_python/TRUNK/oship/src/oship/atbldr
>
the code above returns:
/home/tim/ref_impl_python/TRUNK/oship/log/at_build_errors .log
>
but when I tried a branches version that has the path:
/home/tim/ref_impl_python/BRANCHES/LNCCWorkshop/oship/src/oship/atbldr
>
it SHOULD return:
/home/tim/ref_impl_python/BRANCHES/LNCCWorkshop/oship/log/at_build_errors .log
>
but I get:
/home/tim/ref_impl_python/BRANCHES/LNCCWork/oship/log/at_build_errors .log
>
logfile=os.getc wd()
print logfile is correct; but when I add the .rstrip('src/oship/atbldr')
it also strips the 'shop' off of LNCCWorkshop and returns
/home/tim/ref_impl_python/BRANCHES/LNCCWork/oship/log/at_build_errors .log
>
I had two other people looking at this as we did troubleshooting and we
could not determine the cause. It is repeatable with this path name.
In resolution I renamed the branch to just LNCC and it works fine.
>
Thoughts?
>
Tim
>
>
>
>
>
>
>

Always helps to consult documentation when things don't work.

Help on built-in function rstrip:

rstrip(...)
S.rstrip([chars]) -string or unicode

Return a copy of the string S with trailing whitespace removed.
If chars is given and not None, remove characters in chars instead.
If chars is unicode, S will be converted to unicode before stripping

If you give chars to rstrip() it removes all those characters from the string
not that substring.

-Larry

**Dan Stromberg** · Jul 26 '08, 07:25 PM

Re: Stripping parts of a path

On Sat, 26 Jul 2008 08:59:15 -0300, Tim Cook wrote:

Hi All,
>
I just ran into an issue with the rstrip method when using it on path
strings.
>
When executing a function I have a need to strip off a portion of the
current working directory and add on a path to a log file. Initially
this worked great but then I added a branch in SVN which caused the path
to contain 'LNCCWorkshop'. The rstrip() then began removing the
characters 'shop' leaving an incorrect path to the log file. When I
hard coded this path it worked okay but then did the same thing later in
the file when I needed to point to a database. The code worked fine with
a different path. Here are some code fragments.
>
logfile=os.getc wd().rstrip('sr c/oship/atbldr')+'/oship/log/

at_build_errors .log'

>
this worked when the path was:
/home/tim/ref_impl_python/TRUNK/oship/src/oship/atbldr
>
the code above returns:
/home/tim/ref_impl_python/TRUNK/oship/log/at_build_errors .log
>
but when I tried a branches version that has the path:
/home/tim/ref_impl_python/BRANCHES/LNCCWorkshop/oship/src/oship/atbldr
>
it SHOULD return:
/home/tim/ref_impl_python/BRANCHES/LNCCWorkshop/oship/log/

at_build_errors .log

>
but I get:
/home/tim/ref_impl_python/BRANCHES/LNCCWork/oship/log/

at_build_errors .log

>
logfile=os.getc wd()
print logfile is correct; but when I add the .rstrip('src/oship/atbldr')
it also strips the 'shop' off of LNCCWorkshop and returns
/home/tim/ref_impl_python/BRANCHES/LNCCWork/oship/log/

at_build_errors .log

>
I had two other people looking at this as we did troubleshooting and we
could not determine the cause. It is repeatable with this path name. In
resolution I renamed the branch to just LNCC and it works fine.
>
Thoughts?
>
Tim

Is this the Tim Cook I worked with at UCI?

Anyway, I think the os.path module might have something for you. As a
little bonus, it should produce code that works well with other operating
systems, and should deal gracefully with repeated slashes.

**Tim Roberts** · Jul 27 '08, 04:35 AM

Re: Stripping parts of a path

Tim Cook <timothywayne.c ook@gmail.comwr ote:

>
>I just ran into an issue with the rstrip method when using it on path
>strings.
>
>When executing a function I have a need to strip off a portion of the
>current working directory and add on a path to a log file. Initially
>this worked great but then I added a branch in SVN which caused the path
>to contain 'LNCCWorkshop'. The rstrip() then began removing the
>characters 'shop' leaving an incorrect path to the log file. When I
>hard coded this path it worked okay but then did the same thing later in
>the file when I needed to point to a database. The code worked fine with
>a different path. Here are some code fragments.
>
>logfile=os.get cwd().rstrip('s rc/oship/atbldr')+'/oship/log/at_build_errors .log'

This doesn't do what you think it does. The parameter to rstrip is a set:
as long as the last character is in the set 'abcdhiloprs/', it will remove
it and check the next one. All of the characters in "shop" are in that
set.

In a few minutes, I couldn't think of a clever one-liner to do this. You
could do it with re.sub, but that seems like overkill.

chk = '/src/oship/atbldr'
cwd = os.getcwd()
if cwd.endswith( chk ):
cwd = cwd[:-len(chk)]
--
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

**Tim Cook** · Jul 27 '08, 08:25 AM

Re: Stripping parts of a path

On Sun, 2008-07-27 at 04:32 +0000, Tim Roberts wrote:

This doesn't do what you think it does. The parameter to rstrip is a set:
as long as the last character is in the set 'abcdhiloprs/', it will remove
it and check the next one. All of the characters in "shop" are in that
set.

Thanks for all the replies.
You are correct I misunderstood the docs. Finding and slicing works
great.

Cheers,
Tim

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Stripping parts of a path

Stripping parts of a path

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