On 4/2/2010 1:28 PM, Paul McGuire wrote:
On Apr 1, 5:34 pm, kj<no.em...@please.post> wrote:
When coding C I have often found static local variables useful for
doing once-only run-time initializations. For example:
Here is a decorator to make a function self-aware, giving it a "this"
variable that points to itself, which you could then initialize from
outside with static flags or values:
from functools import wraps
def self_aware(fn):
@wraps(fn)
def fn_(*args):
return fn(*args)
fn_.__globals__["this"] = fn_
return fn_
In 3.1, at least, the wrapper is not needed.
def self_aware(fn):
fn.__globals__["this"] = fn
return fn
Acts the same
@self_aware
def foo():
this.counter += 1
print this.counter
foo.counter = 0
Explicit and separate initialization is a pain. This should be in a
closure or class.
foo()
foo()
foo()
Prints:
1
2
3
However, either way, the __globals__ attribute *is* the globals dict,
not a copy, so one has
>>> this
<function foo at 0x00F5F5D0>
Wrapping a second function would overwrite the global binding.
Terry Jan Reedy
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