On 5.2.2012 3:31, John O'Hagan wrote:
On Sat, 04 Feb 2012 02:27:56 +0200
Antti J Ylikoski<antti.yliko...@tkk.fi> wrote:
[...]
# Make a Common LISP-like closure with Python.
#
# Antti J Ylikoski 02-03-2012.
def f1():
n = 0
def f2():
nonlocal n
n += 1
return n
return f2
[...]
i. e. we can have several functions with private local states which
are kept between function calls, in other words we can have Common
LISP-like closures.
I'm not sure how naughty this is, but the same thing can be done without using
nonlocal by storing the local state as an attribute of the enclosed function
object:
def f():
... def g():
... g.count += 1
... return g.count
... g.count = 0
... return g
...
h = f()
j = f()
h()
1
h()
2
h()
3
j()
1
j()
2
j()
3
This way, you can also write to the attribute:
j.count = 0
j()
1
John
Yes, I do know that, but then it would not be a closure :-)))))))))
Andy
--
http://mail.python.org/mailman/listinfo/python-list
