altering an object as you iterate over it?
johnjsal at NOSPAMgmail.com
Fri May 19 21:28:35 CEST 2006
John Salerno wrote:
> What is the best way of altering something (in my case, a file) while
> you are iterating over it? I've tried this before by accident and got an
> error, naturally.
> I'm trying to read the lines of a file and remove all the blank ones.
> One solution I tried is to open the file and use readlines(), then copy
> that list into another variable, but this doesn't seem very efficient to
> have two variables representing the file.
> Perhaps there's also some better to do it than this, including using
> readlines(), but I'm most interested in just how you edit something as
> you are iterating with it.
Slightly new question as well. here's my code:
phonelist = open('file').readlines()
new_phonelist = phonelist
for line in phonelist:
if line == '\n':
But I notice that there are still several lines that print out as '\n',
so why doesn't it work for all lines?
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