Need help running external program

[Rigga]

Tim Jarman wrote:

> Rigga wrote:
> 
>> Pink wrote:
>> 
>>> Rigga wrote:
>>> 
>>>> Hi,
>>>> 
>>>> I am running the line of code below from a shell script and it works
>>>> fine, however I am at a total loss on how i can run it from within a
>>>> Python script as every option I have tried fails and it appears to be
>>>> down to the escaping of certain characters.
>>>> 
>>>> wget -q www.anywebpage.com -O - | tr '\r' '\n' | tr \' \" | sed -n
>>>> 's/.*url="\([^"]*\)".*/\1/p'
>>> If your problem is getting a python string without worrying about how to
>>> escape the escape sequences, try:
>>> 
>>> r"""wget -q www.anywebpage.com -O - | tr '\r' '\n' | tr \' \" | sed -n
>>> 's/.*url="\([^"]*\)".*/\1/p'"""
>>> 
>>> You should be able to pass this directly to a popen() function.
>> 
>> Hi,
>> 
>> Thanks for replying however I have just tried that and it does not seem
>> to work, it doesnt return any results (i take it the r was a typo)
>> 
>> Thanks
>> 
>> RiGGa
> 
> No, the r was the point - it's there to tell Python not to do any escaping
> on the string. Try it again with the r and see what happens.
> 
Brilliant!!!  that works a treat thankyou!!, where on earth did you find out
about the 'r'  any pointers to documentation appreciated.

Thanks 

RiGGa