Question

I’m using telnetlib to get a few lines of text (tn = telnetlib).

o = cStringIO.StringIO(tn.read_all())

# this prints the entire text as it should (a few lines)
print o.getvalue()
o.close()

Now, is there a way to search based on a string and replace an entire line in the cStringIO buffer if the string is found?
I did this with files on disk, but it’s not very organised. The code is a mess and I need a lot of temporary files, I need to make a lot of search and replace operations.

Answer 1

small variant on @Sven Marnach’s answer:

from cStringIO import StringIO
lines = tn.read_all().splitlines(True) # keep \n
o = StringIO()
for line in lines:
    if search_string in line:
        line = replacement_string # or line = line.replace(search_string, new_string) 
    o.write(line)