Andrew Koenig wrote:
> Why can't you do this?
> foo = log.setdefault(r,'')
> foo += "test %d\n" % t
You can do it, but it's useless!
>>> d = {}
>>> foo = d.setdefault(42, "buckle")
>>> foo += " my shoe"
>>> d
{42: 'buckle'}
What Mr. Leighton wanted is *impossible* when the value
concerned is immutable, because by the time you get to
the += operator, there's no information left about where
the value came from, and thus no way to update the
dict with the new value.
Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury, | A citizen of NewZealandCorp, a |
Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. |
greg@cosc.canterbury.ac.nz +--------------------------------------+
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