[Tutor] file open (take 2)

[Dave S]

Hi,

I am trying to read in an ascii text file, do some alterations and write it 
back.

file = open(self.config.get('pdf','cert') + '/cert.pdf' , 'r+')
lines = file.readlines()

... process lines ...

file.writelines(lines)
file.close()

works but ends up appending a second modified copy to the original ... as per 
the python ref.

Am I right in thinking that the only way is to open with a 'r', close them 
open with a 'w' ?

Cheers

Dave