[Python-ideas] Ruby-style Blocks in Python Idea (alternative)

[Terry Reedy]

Leonardo Santagada wrote:
> 
> On Mar 9, 2009, at 9:13 PM, Jan Kanis wrote:
> 
>> def callback(param) as result with do_something(with_our(callback),
>> other, args):
>>     print("called back with "+param)
>>     return foobar(param)
>>
>>
>> this would be equivalent to
>>
>> def callback(param):
>>     print("called back with "+param)
>>     return foobar(param)
>>     
>> result = do_something(with_our(callback), other_args)
> 
> 
> Not only the equivalent code looks much cleaner,

I completely agree.

 > the only good thing it
> actually do (not having to first define a function to then use it) can 
> be accomplished with a decorator.

If a decolib were ever assembled, a callback(receiving_func, args) would 
be a good one to include.

I think I understand now that one of the reasons to use a decorator is 
to say what you are going to do with a function before you define it so 
that the person reading the definition can read it in that light.  What 
I like is that the decorator form still leaves the definition cleanly 
separate from the context.

tjr