On Thu, Aug 26, 2004, David Abrahams wrote:
>
> I just discovered the following behavior:
>
> C:\Documents and Settings\dave>python
> Python 2.3 (#46, Aug 25 2003, 18:37:29) [MSC v.1200 32 bit (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
> >>> prefix = ['foo', 'bar', 'baz']
> >>> prefix += 'bomb' # meant to write prefix += [ 'bomb' ]
> >>> prefix
> ['foo', 'bar', 'baz', 'b', 'o', 'm', 'b']
> >>>
>
> Is it new and/or intentional? I would have expected an error from the
> +=. I was very surprised when my error "passed silently".
>>> l = ['foo']
>>> l += ('bar', 'baz')
>>> l
['foo', 'bar', 'baz']
Augmented assignment for lists works with any sequence type (and
probably iterators, too, but I didn't check). Strings are a sequence
type, which occasionally has unintended consequences.
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