Bitten by my C/Java experience

[Andrew Cooper]

On 04/05/2015 18:43, Ian Kelly wrote:
> 
> Some other gotchas that aren't necessarily related to C/Java but can
> be surprising nonetheless:
> 
> *    () is a zero-element tuple, and (a, b) is a two-element tuple,
> but (a) is not a one-element tuple. Tuples are created by commas, not
> parentheses, so use (a,) instead.

* {} is an empty set(), not dict().

Particularly subtle when combined with **kwargs

$ 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