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Tue Apr 24 22:15:04 EDT 2001 · http://mail.python.org/pipermail/python-list/2001-April/077580.html

On 22 Apr 2001 15:52:23 -0400, Douglas Alan
 <nessus at mit.edu> wrote:
> jepler at inetnebr.com (Jeff Epler) writes:
> 
>> This particular example can be done with very nearly the same syntax in
>> standard Python---a dot instead of whitespace between let/set and the
>> variable in question.
> 
>> >>> import letset, __main__; letset.setup(__main__)
>> >>> let.x = 3
>> >>> x
>> 3
>> >>> let.x = 4
>> Traceback (most recent call last):
> 
> Thanks for the ideas.  I think my coworkers might kill me if I
> programmed this way, though.
> 
> How do I use this for local variables?  Like so?
[snip]

I might write (all this is off the top of my head)
	import letset
	class NS:
		def __init__(self, **kw):
			self.__dict__.extend(kw)
			letset.setup(self)

	def add10(x):
		l = NS(locals())
		l.let.y = 10
		return l.x + l.y
which eliminates one line of boilerplate, and gets the arguments into `l'.

You could also do
	def ns(dict):
		x = NS(dict)
		return x.let, x.set, x

	def add10(x):
		let, set, get = ns(locals())
		let.y = 10
		return get.x + get.y

A package like bytecodehacks plus custom importhooks might permit you
to automatically insert the line of boilerplate.

By the way, this is also a great way to get static function variables:
	def add10(x, static=NS(y=10)):
		return x + static.y

Jeff Epler
jepler at inetnebr.com

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