From: Paul Rubin on
"Zooko O'Whielacronx" <zookog(a)> writes:
> Every couple of years I run into a problem where some Python code that
> worked well at small scales starts burning up my CPU at larger scales,
> and the underlying issue turns out to be the idiom of accumulating
> data by string concatenation.

I usually use StringIO or cStringIO for that (python 2.x syntax):

buf = cStringIO()
buf.write("first thing")
buf.write("second thing")
result = buf.getvalue()

Sometimes I like to use a generator instead:

def stuff():
yield "first thing"
yield "second thing"

result = ''.join(stuff())