Why is Python popular, while Lisp and Scheme aren't?

[Michael Hudson]

Courageous <jkraska at san.rr.com> writes:

> I still disagree with the decision to not have a defgenerator clause
> (or equivalent) however. BDFL pronuncements in the PEP notwithstanding.

Live with it.

> For one thing, had yield not been meant to imply generator in the
> context of the function in which it is used, yield could have been
> executed in the body of a function which perculated that being
> yielded to the first appropriate defgenerator in the invocation
> stack, somewhat like a limited kind of continuation. To wit:
> 
> defgenerator g ():
> 
> 	f()
> 
> def f():
> 
> 	while 1:
> 
> 		yield None
> 
> x = g()
> 
> while x.next():
> 
> 	something()
> 
> Ddon't know about actual _implementation_ mind you, but it struck
> me that it would be quite useful if "yield" actually raised something
> that was next()able. x = g() would therefore be syntactic sugar for
> "except Continuable, c:"

You'd have to know at compile time whether g() referred to a generator
of not, wouldn't you?  That ain't gonna work.

Cheers,
M.

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