From: Csaba Henk <csaba@..._the_subdomain.creo.hu>
Date: 2006-07-27T08:25:11+09:00
Subject: Re: For performance, write it in C

On 2006-07-26, Sean O'Halpin <sean.ohalpin@gmail.com> wrote:
> implemented. For example, Ruby has real closures, Python doesn't. I

Even if OT, just for the sake of correctness: let me remark that Python
does have closures. Local functions (ones defined within another
function's body) are scoped lexically.

It's just sort of an anti-POLA (and inconvenient, as-is) piece of
semantics that variables get reinitalized upon assignment.

Hence:

def foo():
    x = 5
    def bar():
        x = 6
        return x
    bar()
    return x, bar

x, bar = foo()
print x, bar() ==> 5 6

def foo():
    _x = [5]
    def bar():
        _x[0] = 6
        return _x[0]
    bar()
    return _x[0], bar

x, bar = foo()
print x, bar()  ==> 6 6


Regards,
Csaba