pitfall for your amusement

[Bryan Richard]

Andrew Koenig wrote:

>>> >>> x = (1, 2, 3)
> 
>>> >>> x += (4, 5, 6)
> 
> Gustavo> Hey, shouldn't this raise an exception?
> 
> Perhaps it should, but it doesn't:  If x is a tuple,
> 
> x += y
> 
> is equivalent to
> 
> x = x + y
> 
> which creates a brand-new object and (re)binds x to it.
> 

I had never heard of this pitfall, so I had to run it.

>>> id(x)
135374140
>>> id(y)
135321812
>>> id (x1)
135373676
>>> id(y1)
135373676

Stupid question: Is object 135321812 destroyed if I now run 

y += (4, 5, 6)

- Bryan