[Tutor] Replacing part of a URL

[Shashwat Anand]

>
> They may be of varying lengths, but they'll always end with
> .something_or_other.html
>

Missed this point. You can use posixpath module too as an option.
>>> url = 'http://www.somesite.com/some/path/to/something.html
>>> var = 'anotherthing'
>>> posixpath.dirname(url)
'http://www.somesite.com/some/path/to'
>>> posixpath.dirname(url) + '/' + var + '.html'
'http://www.somesite.com/some/path/to/anotherthing.html'


On Sun, Feb 21, 2010 at 4:45 AM, Shashwat Anand <anand.shashwat at gmail.com>wrote:

> >>> url = 'http://www.somesite.com/some/path/to/something.html'
> >>> var = 'anotherthing'
> >>> i = url.rfind('/') + 1
> >>> j = url.rfind('.')
> >>> if i < j:
> ...     newurl = url[:i] + var + url[j:]
> ... else:
> ...     newurl = url[:i] + var
> >>> newurl
> 'http://www.somesite.com/some/path/to/anotherthing.html'
>
> Changing the url to 'http://www.somesite.com/some/path/to/something' we
> get newurl as 'http://www.somesite.com/some/path/to/anotherthing'
>
> However if you are absolutely sure the pattern is '
> http://www.somesite.com/some/path/to/something.html' , then you can simply
> write one-liner as:
> >>> url[:url.rfind('/') + 1] + var + url[url.rfind('.'):]
> 'http://www.somesite.com/some/path/to/anotherthing.html'
>
> Literally the same stuff. I don't think you need regex for such simple
> string manipulation.
>
> ~l0nwlf
>
>
> On Sun, Feb 21, 2010 at 4:04 AM, Lao Mao <laomao1975 at googlemail.com>wrote:
>
>> Hello,
>>
>> I need to be able to replace the last bit of a bunch of URLs.
>>
>> The urls look like this:
>>
>> www.somesite.com/some/path/to/something.html
>>
>> They may be of varying lengths, but they'll always end with
>> .something_or_other.html
>>
>> I want to take the "something" and replace it with something else.
>>
>> My current plan is to simply do a string.split("/")[-1]
>>
>> and then another .split('.') to result in ['something', 'html'], and then
>> replace sometihing, and join them together again.
>>
>> But - wouldn't it make more sense to do this with re.sub?
>>
>> In which case, how would I specify only the bit between the last / and the
>> .html?
>>
>> Thanks,
>>
>> Laomao
>>
>> _______________________________________________
>> Tutor maillist  -  Tutor at python.org
>> To unsubscribe or change subscription options:
>> http://mail.python.org/mailman/listinfo/tutor
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/tutor/attachments/20100221/10150c2a/attachment.html>