On Sat, 24 Sept 2022 at 07:52, Meredith Montgomery
<mmontgom...@levado.to> wrote:
>
> def Counter(name = None):
> o = {"name": name if name else "untitled", "n": 0}
> def inc(o):
> o["n"] += 1
> return o
> o["inc"] = inc
> def get(o):
> return o["n"]
> o["get"] = get
> return o
>
Want a neat demo of how classes and closures are practically the same thing?
def Counter(name=None):
if not name: name = "untitled"
n = 0
def inc():
nonlocal n; n += 1
def get():
return n
return locals()
Aside from using a nonlocal declaration rather than "self.n", this is
extremely similar to classes, yet there are no classes involved.
A class statement creates a namespace. The locals() function returns
the function's namespace.
Each call to Counter() creates a new closure context, just like each
call to a constructor creates a new object.
There's very little difference, at a fundamental level :)
ChrisA
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