On Feb 2, 2011, at 2:08 PM, Anthony wrote:
> Anyone? Is using local_import to import a class into a model/controller just
> as safe as using 'from a import A' (i.e., in terms of memory leaks), or do
> you have to use the Python import statement directly?
It should be equivalent; both end up call
Anyone? Is using local_import to import a class into a model/controller just
as safe as using 'from a import A' (i.e., in terms of memory leaks), or do
you have to use the Python import statement directly?
On Tuesday, February 1, 2011 5:25:51 PM UTC-5, Anthony wrote:
> But what if 'local_import
On Feb 2, 1:26 am, cjrh wrote:
> "Now now we know the cause, why doesn't it happen if you have a
> module? The reason for that is that Python will do a trick when it
> shuts down modules. It will override all global values that do not
> begin with an underscore with None"
Can you provide a proo
On 1 fév, 21:16, Massimo Di Pierro wrote:
> In web2py you cannot store instances of objects into session. While
> Armin makes it tool like this is a web2py problem this is more complex
> and general than that. In Python if you pickle and object that is
> instance of a class defined in /path1/mymo
On Feb 1, 10:16 pm, Massimo Di Pierro
wrote:
> From the usual source:
> http://lucumr.pocoo.org/2011/2/1/exec-in-python/
His post is pretty good and informative.
> What would really be useful to us is an example of how to overcome
> that problem by showing how to break those implicit self refere
There is no problem if they have no __del__ method.
On Feb 1, 5:24 pm, Jonathan Lundell wrote:
> On Feb 1, 2011, at 12:16 PM, Massimo Di Pierro wrote:
>
>
>
> > I agree with Armin that in the case of exec (and web2py uses exec),
> > the self references are created whether you want them or not. T
Not quite like that. It is more like (web2py specific):
"Do not declare classes with a __del__ method in web2py models or
controllers or instances of those classes will cause memory leaks"
AND (for any python program)
"Do not declare classes with a __del__ method in any Python program
unless you
You are correct. There ar no problems using trunk (and future web2py
versions) if classes have no __del__ method.
On Feb 1, 5:00 pm, Anthony wrote:
> On Tuesday, February 1, 2011 3:16:12 PM UTC-5, Massimo Di Pierro wrote:
> > In web2py you cannot store instances of objects into session. While
> >
If what I thought above is true, a warning like this sufficient:
"Global objects/variables in controllers might (will?) cause memory
leaks".
If this is what the criticism of web2py amounts to, I think it's a
storm in a tea cup.
It's interesting to note that even the variable "c" in my example
above is properly destroyed with execfile('test.py', {}).
What does this mean?
I think this means that YES you can define classes inside a web2py
controller without memory leaks, as long as there are no global
(within the controll
On Tuesday, February 1, 2011 3:16:12 PM UTC-5, Massimo Di Pierro wrote:
> In web2py you cannot store instances of objects into session. While
> Armin makes it tool like this is a web2py problem this is more complex
> and general than that. In Python if you pickle and object that is
> instanc
Maybe unnecessary, but here's another test:
+ In foo.py:
class Foo(object):
def __del__(self):
print 'Deleted'
def bar(self):
print "bar::"
b = Foo()
def f():
print "local_func::"
c = Foo()
+ In test.py:
from foo import *
a = Foo()
a.bar()
f()
+ Then,
But what if 'local_import' is used (instead of 'from a import Foo') -- does
local_import work the same as regular Python imports?
On Tuesday, February 1, 2011 5:09:25 PM UTC-5, Massimo Di Pierro wrote:
> I run this test (following Armin's example):
>
> # in file a.py
> class Foo(object):
>
I run this test (following Armin's example):
# in file a.py
class Foo(object):
def __del__(self):
print 'Deleted'
#in file b.py
from a import A
foo=Foo()
#in file c.py
execfile('b.py', {})
execfile('b.py', {})
execfile('b.py', {})
import gc
gc.collect()
running c.py printes
Deleted
One question:
If I define a class externally, and use local_import to import it into
controller or model, will it have these potential problems or not?
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