In article <[EMAIL PROTECTED]>,
The Pythonista <[EMAIL PROTECTED]> wrote:
>
>Yesterday, I was hacking around a bit, trying to figure out how to
>implement the semantics of call/cc in Python. Specifically, I wanted to
>translate this Scheme code to equivalent Python:
>
>####
>
>(define theContinuation #f)
>
> (define (test)
> (let ((i 0))
> (call/cc (lambda (k) (set! theContinuation k)))
> (set! i (+ i 1))
> i))
>
> (test)
> (theContinuation)
> (theContinuation)
>
Python relies on mutables to do this:
class holder: pass
def call():
x = holder()
x.counter = 0
def cc():
x.counter += 1
return x.counter
return cc
foo = call()
print foo()
print foo()
print foo()
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