On Wed, Oct 24, 2018 at 7:55 AM Rhodri James <rho...@kynesim.co.uk> wrote:
> On 24/10/2018 15:04, Calvin Spealman wrote: > > My idea is not "assignment blocks" those already exist. `def` and `class` > > blocks are both syntaxes that assign to some name. I'm just using the > term > > to refer to them as a group. > > > > The proposal is just being able to return them. These two examples become > > equivalent: > > > > def ignore_exc(exc_type): > > return def (func): > > @wraps(func) > > return def (*args, **kwargs): > > try: > > return func(*args, **kwargs) > > except exc_type: > > pass > > > > def ignore_exc(exc_type): > > def decorator(func): > > @wraps(func) > > def wrapped_func(*args, **kwargs): > > try: > > return func(*args, **kwargs) > > except exc_type: > > pass > > return wrapped_func > > return decorator > > Essentially this is a limited multi-line lambda. Either people are > going to be surprised that you can only use it in a return statement or > you have to open the whole can of worms about multi-line lambdas. Good > luck on the latter. > Let's close that can quickly. Syntactically this is much simpler because because there's no trouble with switching between expression-mode and statement-mode. Also note that syntactically it is clearly a special form of `def` statement -- it can even be decorated! So let's review the proposal as a shorthand for defining a function and immediately returning it. It saves one line plus picking a name. I personally don't think that's enough of a benefit to warrant the extra syntactic complexity (even if modest). -- --Guido van Rossum (python.org/~guido)
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