On Thu, 26 Apr 2018 15:34:17 +1000
Steven D'Aprano
On Thu, Apr 26, 2018 at 05:22:58PM +1200, Greg Ewing wrote:
Ćukasz Langa wrote:
What was its own assignment before now is part of the logic test. This saves on vertical whitespace but makes parsing and understanding logic tests harder.
Another way to say this is that expressions are no longer restricted to being trees, but can be general DAGs, which require more mental effort to understand.
Is that right? I presume you mean that there can be cycles in expressions involving binding-expressions. If not, what do you mean?
Can you give an example of a Python expression, involving PEP 572 binding-expressions, that is not a tree but a more general DAG or that contains cycles?
Depends if you mean a graph between names or values? If between names, you can even have cycles AFAICT: ((a: = a + b), (b: = a)) Regards Antoine.