Bitten by my C/Java experience

[random832 at fastmail.us]

On Mon, May 4, 2015, at 16:57, Andrew Cooper wrote:
> * {} is an empty set(), not dict().

You've got it backwards.

> Particularly subtle when combined with **kwargs

The function in your example below _always_ returns a set, and kwargs is
always a dict. There's no subtlety outside of the repr output. The fact
that the empty set (as a result of empty kwargs) repr's as set() is a
consequence of the fact that {} is a dict.

> 
> $ python3
> Python 3.4.0 (default, Apr 11 2014, 13:05:11)
> [GCC 4.8.2] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> >>> def foo(**kwargs):
> ...   return { (k, kwargs[k]) for k in kwargs }
> ...
> >>> foo()
> set()
> >>> foo(a=1)
> {('a', 1)}
> >>>
> 
> ~Andrew
> -- 
> https://mail.python.org/mailman/listinfo/python-list


-- 
Random832