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There&amp;amp;amp;#39;s a common anti-pattern of using a string as an accumulating string
buffer, e.g.:

buf = &amp;amp;amp;quot;&amp;amp;amp;quot;
while ...:
    buf += &amp;amp;amp;quot;something&amp;amp;amp;quot;
use(buf)

This is highly inefficient. The right pattern is to use StringIO, but
this requires rewriting code to use .write() method:

buf = StringIO()
while ...:
    buf.write(&amp;amp;amp;quot;something&amp;amp;amp;quot;)
use(buf.getvalue())

Instead, by introducing implementation of __iadd__ (+=) method, effectively
making it an alias for .write(), it allows for very clear and co... (continued)

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