So, here's some info about how to see what's going on with Python's
memory allocation: https://docs.python.org/3/library/tracemalloc.html
. I haven't looked into this in a long time, but it used to be the
case that you needed to compile native modules (and probably Python
itself?) so that
On 2024-01-17 3:01 AM, Greg Ewing via Python-list wrote:
On 17/01/24 1:01 am, Frank Millman wrote:
I sometimes need to keep a reference from a transient object to a more
permanent structure in my app. To save myself the extra step of
removing all these references when the transient object is
On 17/01/24 1:01 am, Frank Millman wrote:
I sometimes need to keep a reference from a
transient object to a more permanent structure in my app. To save myself
the extra step of removing all these references when the transient
object is deleted, I make them weak references.
I don't see how
On 17/01/24 4:00 am, Chris Angelico wrote:
class Form:
def __init__(self):
self.elements = []
class Element:
def __init__(self, form):
self.form = form
form.elements.append(self)
If you make the reference from Element to Form a weak reference,
it won't
> On 16 Jan 2024, at 12:10, Frank Millman via Python-list
> wrote:
>
> My problem is that my app is quite complex, and it is easy to leave a
> reference dangling somewhere which prevents an object from being gc'd.
What I do to track these problems down is use gc.get_objects() then
> On 16 Jan 2024, at 13:17, Thomas Passin via Python-list
> wrote:
>
> The usual advice is to call deleteLater() on objects derived from PyQt
> classes. I don't know enough about PyQt to know if this takes care of all
> dangling reference problems, though.
It works well and robustly.
On Wed, 17 Jan 2024 at 01:45, Frank Millman via Python-list
wrote:
>
> On 2024-01-16 2:15 PM, Chris Angelico via Python-list wrote:
> >
> > Where do you tend to "leave a reference dangling somewhere"? How is
> > this occurring? Is it a result of an incomplete transaction (like an
> > HTTP request
On 2024-01-16 2:15 PM, Chris Angelico via Python-list wrote:
Where do you tend to "leave a reference dangling somewhere"? How is
this occurring? Is it a result of an incomplete transaction (like an
HTTP request that never finishes), or a regular part of the operation
of the server?
I have a
On 1/16/2024 4:17 AM, Barry wrote:
On 16 Jan 2024, at 03:49, Thomas Passin via Python-list
wrote:
This kind of thing can happen with PyQt, also. There are ways to minimize it
but I don't know if you can ever be sure all Qt C++ objects will get deleted.
It depends on the type of object
On Tue, 16 Jan 2024 at 23:08, Frank Millman via Python-list
wrote:
>
> On 2024-01-15 3:51 PM, Frank Millman via Python-list wrote:
> > Hi all
> >
> > I have read that one should not have to worry about garbage collection
> > in modern versions of Python - it 'just works'.
> >
> > I don't want to
On 2024-01-15 3:51 PM, Frank Millman via Python-list wrote:
Hi all
I have read that one should not have to worry about garbage collection
in modern versions of Python - it 'just works'.
I don't want to rely on that. My app is a long-running server, with
multiple clients logging on, doing
> On 16 Jan 2024, at 03:49, Thomas Passin via Python-list
> wrote:
>
> This kind of thing can happen with PyQt, also. There are ways to minimize it
> but I don't know if you can ever be sure all Qt C++ objects will get deleted.
> It depends on the type of object and the circumstances.
On 1/15/2024 9:47 PM, Akkana Peck via Python-list wrote:
I wrote:
Also be warned that some modules (particularly if they're based on libraries
not written in Python) might not garbage collect, so you may need to use other
methods of cleaning up after those objects.
Chris Angelico writes:
On Tue, 16 Jan 2024 at 13:49, Akkana Peck via Python-list
wrote:
>
> I wrote:
> > > Also be warned that some modules (particularly if they're based on
> > > libraries not written in Python) might not garbage collect, so you may
> > > need to use other methods of cleaning up after those objects.
I wrote:
> > Also be warned that some modules (particularly if they're based on
> > libraries not written in Python) might not garbage collect, so you may need
> > to use other methods of cleaning up after those objects.
Chris Angelico writes:
> Got any examples of that?
The big one for me was
On Tue, 16 Jan 2024 at 06:32, Akkana Peck via Python-list
wrote:
>
> > Frank Millman wrote at 2024-1-15 15:51 +0200:
> > >I have read that one should not have to worry about garbage collection
> > >in modern versions of Python - it 'just works'.
>
> Dieter Maurer via Python-list writes:
> > There
> Frank Millman wrote at 2024-1-15 15:51 +0200:
> >I have read that one should not have to worry about garbage collection
> >in modern versions of Python - it 'just works'.
Dieter Maurer via Python-list writes:
> There are still some isolated cases when not all objects
> in an unreachable cycle
Frank Millman wrote at 2024-1-15 15:51 +0200:
>I have read that one should not have to worry about garbage collection
>in modern versions of Python - it 'just works'.
There are still some isolated cases when not all objects
in an unreachable cycle are destroyed
(see e.g. step 2 of
> I do have several circular references. My experience is that if I do not
> take some action to break the references when closing the session, the
> objects remain alive. Below is a very simple program to illustrate this.
>
> Am I missing something? All comments appreciated.
Python has normal
On 25/10/23 2:32 pm, Chris Angelico wrote:
Error correcting memory, redundant systems, and human
monitoring, plus the ability to rewrite the guidance software on the
fly if they needed to.
Although the latter couldn't actually be done with the AGC,
as the software was in ROM. They could poke
Passin via Python-list
Sent: Thursday, October 26, 2023 6:50 PM
To: python-list@python.org
Subject: Re: Question(s)
On 10/26/2023 6:36 PM, AVI GROSS via Python-list wrote:
I am not one for IDLE worship, Tenor. But if you have been getting a
message here, it is that there are an amazing number
: Thursday, October 26, 2023 6:50 PM
To: python-list@python.org
Subject: Re: Question(s)
On 10/26/2023 6:36 PM, AVI GROSS via Python-list wrote:
> I am not one for IDLE worship, Tenor. But if you have been getting a
message here, it is that there are an amazing number of programs that
support your
On 10/26/2023 6:36 PM, AVI GROSS via Python-list wrote:
I am not one for IDLE worship, Tenor. But if you have been getting a message
here, it is that there are an amazing number of programs that support your use
of python during the development phase and perhaps later. I actually often use
an
on.
-Original Message-
From: Python-list On
Behalf Of o1bigtenor via Python-list
Sent: Thursday, October 26, 2023 8:34 AM
To: Michael Torrie
Cc: python-list@python.org
Subject: Re: Question(s)
On Wed, Oct 25, 2023 at 10:19 AM Michael Torrie via Python-list
wrote:
>
> On 10/25/23
On 2023-10-26, o1bigtenor wrote:
> On Wed, Oct 25, 2023 at 10:19 AM Michael Torrie via Python-list
> wrote:
>>
>> On 10/25/23 05:51, o1bigtenor via Python-list wrote:
>> > Looks like I have another area to investigate. (grin!)
>> > Any suggestions?
>>
>> Seems to me you're trying to run before you
On 10/26/2023 4:25 PM, o1bigtenor via Python-list wrote:
On Thu, Oct 26, 2023 at 11:43 AM Michael Torrie via Python-list
wrote:
On 10/26/23 06:34, o1bigtenor wrote:
Interesting - - - - ". . . see if it runs." - - - that's the issue!
When the code is accessing sensors there isn't an easy way
On Thu, Oct 26, 2023 at 11:47 AM Michael Torrie via Python-list
wrote:
>
> On 10/26/23 10:41, Michael Torrie wrote:
> > By the way you definitely can step
> > through MicroPython code one line at a time with a remote debugger, say
> > with Visual Studio Code.
>
> I meant to edit that bit out.
On Thu, Oct 26, 2023 at 11:43 AM Michael Torrie via Python-list
wrote:
>
> On 10/26/23 06:34, o1bigtenor wrote:
> > Interesting - - - - ". . . see if it runs." - - - that's the issue!
> > When the code is accessing sensors there isn't an easy way to
> > check that the code is working until one
On 10/26/23 10:41, Michael Torrie wrote:
> By the way you definitely can step
> through MicroPython code one line at a time with a remote debugger, say
> with Visual Studio Code.
I meant to edit that bit out. After doing a bit more research, it
appears remote debugging with MicroPython may not
On 10/26/23 06:34, o1bigtenor wrote:
> Interesting - - - - ". . . see if it runs." - - - that's the issue!
> When the code is accessing sensors there isn't an easy way to
> check that the code is working until one has done the all of the
> physical construction. If I'm trying to control a
On 10/26/2023 7:50 AM, o1bigtenor via Python-list wrote:
On Wed, Oct 25, 2023 at 9:10 AM Dieter Maurer wrote:
o1bigtenor wrote at 2023-10-25 08:29 -0500:
...
It would appear that something has changed.
Went to the Eclipse download page, downloaded and verified (using sha-512).
Expanded
On Wed, Oct 25, 2023 at 3:56 PM Jim Schwartz wrote:
> Does this link help? It seems to have a Linux package here.
>
> Eclipse Packages | The Eclipse Foundation - home to a global community,
> the Eclipse IDE, Jakarta EE and over 350 open source projects...
>
On Wed, Oct 25, 2023 at 11:58 AM Michael F. Stemper via Python-list
wrote:
>
> On 25/10/2023 05.45, o1bigtenor wrote:
> > On Tue, Oct 24, 2023 at 8:35 PM Chris Angelico via Python-list
> > wrote:
>
> >> 3. Catch the failure before you commit and push. Unit tests are great for
> >> this.
> >
> >
On Wed, Oct 25, 2023 at 10:19 AM Michael Torrie via Python-list
wrote:
>
> On 10/25/23 05:51, o1bigtenor via Python-list wrote:
> > Looks like I have another area to investigate. (grin!)
> > Any suggestions?
>
> Seems to me you're trying to run before you have learned to walk.
>
> Slow down, go
On Wed, Oct 25, 2023 at 9:10 AM Dieter Maurer wrote:
>
> o1bigtenor wrote at 2023-10-25 08:29 -0500:
> > ...
> >It would appear that something has changed.
> >
> >Went to the Eclipse download page, downloaded and verified (using sha-512).
> >Expanded software to # opt .
> >There is absolutely NO
Subject: Re: Question(s)
On 24/10/2023 18.15, o1bigtenor wrote:
> What is interesting about this is the absolute certainty that it is impossible
> to program so that that program is provably correct.
Not entirely true. If I was to write a program to calculate Fibonacci
numbers, or ech
Does this link help? It seems to have a Linux package here.
[1]Eclipse Packages | The
Eclipse Foundation - home to
a global community, the
Eclipse IDE, Jakarta EE and [2]favicon.ico
over 350 open source
projects...
eclipse.org
Sent from my iPhone
On Oct 25,
On 2023-10-25, o1bigtenor wrote:
> On Wed, Oct 25, 2023 at 7:00 AM Dieter Maurer wrote:
>> [...]
>> There are several others,
>> e.g. "ECLIPSE" can be used for Python development.
>
> Is 'Eclipse' a Windows oriented IDE?
> (Having a hard time finding linux related information on the
> website.)
On 10/25/2023 9:20 AM, Michael F. Stemper via Python-list wrote:
On 24/10/2023 17.50, Thomas Passin wrote:
The programming team for the Apollo moon mission developed a system
which,> if you would write your requirements in a certain way, could
generate correct
C code for them.
Since the
On 10/25/2023 8:50 AM, o1bigtenor via Python-list wrote:
On Wed, Oct 25, 2023 at 7:00 AM Dieter Maurer wrote:
o1bigtenor wrote at 2023-10-25 06:44 -0500:
On Wed, Oct 25, 2023 at 6:24?AM Dieter Maurer wrote:
...
There are different kinds of errors.
Some can be avoided by using an
On 25/10/2023 12:44, o1bigtenor via Python-list wrote:
> Haven't heard of a python IDE - - - doesn't mean that there isn't such - -
There are literally dozens with varying degrees of smartness.
The big 4 all have Python plugins/environments:
Eclipse, Netbeans, VisualStudio, IntelliJ
And of
On 25/10/2023 05.45, o1bigtenor wrote:
On Tue, Oct 24, 2023 at 8:35 PM Chris Angelico via Python-list
wrote:
3. Catch the failure before you commit and push. Unit tests are great for this.
Where might I find such please.
You don't "find" unit tests; you write them. A unit test tests
a
g, what do
developers using Python do to try to make sure they get properly paid and
others do not just use their work without permission?
-Original Message-
From: o1bigtenor
Sent: Wednesday, October 25, 2023 6:59 AM
To: avi.e.gr...@gmail.com
Cc: Chris Angelico ; python-list@python.org
S
On 10/25/23 05:51, o1bigtenor via Python-list wrote:
> Looks like I have another area to investigate. (grin!)
> Any suggestions?
Seems to me you're trying to run before you have learned to walk.
Slow down, go to the beginning and just learn python, write some code,
see if it runs. Go through
On 24/10/2023 18.15, o1bigtenor wrote:
What is interesting about this is the absolute certainty that it is impossible
to program so that that program is provably correct.
Not entirely true. If I was to write a program to calculate Fibonacci
numbers, or echo back user input, that program
On 24/10/2023 17.50, Thomas Passin wrote:
The programming team for the Apollo moon mission developed a system which,>
if you would write your requirements in a certain way, could generate correct
C code for them.
Since the last Apollo mission was in 1972, when C was first being developed,
On 2023-10-24, o1bigtenor wrote:
> On Tue, Oct 24, 2023 at 5:28 PM Rob Cliffe wrote:
>>
>> There is no general way to prove that a program is "correct". Or even
>> whether it will terminate or loop endlessly.
>> [...]
>> When you come to run your program "for real", and you have to
>>
o1bigtenor wrote at 2023-10-25 08:29 -0500:
> ...
>It would appear that something has changed.
>
>Went to the Eclipse download page, downloaded and verified (using sha-512).
>Expanded software to # opt .
>There is absolutely NO mention of anything python - - - java, c and
>its permutations,
On 10/25/2023 9:21 AM, Thomas Passin wrote:
On 10/25/2023 8:50 AM, o1bigtenor via Python-list wrote:
On Wed, Oct 25, 2023 at 7:00 AM Dieter Maurer
wrote:
o1bigtenor wrote at 2023-10-25 06:44 -0500:
On Wed, Oct 25, 2023 at 6:24?AM Dieter Maurer
wrote:
...
There are different kinds of
On 2023-10-25, o1bigtenor via Python-list wrote:
> Haven't heard of a python IDE - - - doesn't mean that there isn't such - -
> just that I haven't heard of such. Is there a python IDE?
Seriously? Now you're just trolling.
google.com/search?q=python+ide=python+ide
--
Grant
--
On Wed, Oct 25, 2023 at 7:56 AM Dieter Maurer wrote:
>
> o1bigtenor wrote at 2023-10-25 07:50 -0500:
> >> There are several others,
> >> e.g. "ECLIPSE" can be used for Python development.
> >
> >Is 'Eclipse' a Windows oriented IDE?
>
> No.
> ==> "https://en.wikipedia.org/wiki/Eclipse_(software)"
o1bigtenor wrote at 2023-10-25 07:50 -0500:
>> There are several others,
>> e.g. "ECLIPSE" can be used for Python development.
>
>Is 'Eclipse' a Windows oriented IDE?
No.
==> "https://en.wikipedia.org/wiki/Eclipse_(software)"
--
https://mail.python.org/mailman/listinfo/python-list
On Wed, Oct 25, 2023 at 7:00 AM Dieter Maurer wrote:
>
> o1bigtenor wrote at 2023-10-25 06:44 -0500:
> >On Wed, Oct 25, 2023 at 6:24?AM Dieter Maurer wrote:
> > ...
> >> There are different kinds of errors.
> >>
> >> Some can be avoided by using an integrated development environment
> >> (e.g.
o1bigtenor wrote at 2023-10-25 06:44 -0500:
>On Wed, Oct 25, 2023 at 6:24?AM Dieter Maurer wrote:
> ...
>> There are different kinds of errors.
>>
>> Some can be avoided by using an integrated development environment
>> (e.g. misspellings, type mismatches, ...).
>
>Haven't heard of a python IDE -
On Wed, Oct 25, 2023 at 6:20 AM Chris Angelico via Python-list
wrote:
>
> On Wed, 25 Oct 2023 at 21:46, o1bigtenor wrote:
> > > 2. Catch the failure as you save. We have a lot of tools that can help
> > > you to spot bugs.
> >
> > Tools like this for python please.
>
> Various ones. Type
On Wed, 25 Oct 2023 at 22:46, o1bigtenor via Python-list
wrote:
>
> On Wed, Oct 25, 2023 at 6:24 AM Dieter Maurer wrote:
> >
> > o1bigtenor wrote at 2023-10-24 07:22 -0500:
> > > ...
> > >Is there a way to verify that a program is going to do what it is
> > >supposed to do even
> > >before all
On Wed, Oct 25, 2023 at 6:24 AM Dieter Maurer wrote:
>
> o1bigtenor wrote at 2023-10-24 07:22 -0500:
> > ...
> >Is there a way to verify that a program is going to do what it is
> >supposed to do even
> >before all the hardware has been assembled and installed and tested?
>
> Others have already
On Wed, Oct 25, 2023 at 6:25 AM Chris Angelico via Python-list
wrote:
>
> On Wed, 25 Oct 2023 at 21:53, o1bigtenor wrote:
> >
> > Hmm - - - - now how can I combine 'Hamming codes'
> > and a raid array?
> >
> > TIA
>
> Normally you wouldn't. But let's say you're worried that a file might
o1bigtenor wrote at 2023-10-24 07:22 -0500:
> ...
>Is there a way to verify that a program is going to do what it is
>supposed to do even
>before all the hardware has been assembled and installed and tested?
Others have already noted that "verify" is a very strong aim.
There are different kinds
On Wed, 25 Oct 2023 at 21:53, o1bigtenor wrote:
>
> Hmm - - - - now how can I combine 'Hamming codes'
> and a raid array?
>
> TIA
Normally you wouldn't. But let's say you're worried that a file might
get randomly damaged. (I don't think single-bit errors are really a
significant issue
On Wed, 25 Oct 2023 at 21:46, o1bigtenor wrote:
> > 2. Catch the failure as you save. We have a lot of tools that can help
> > you to spot bugs.
>
> Tools like this for python please.
Various ones. Type checkers like MyPy fall into this category if you
set your system up to run them when you
On Tue, Oct 24, 2023 at 9:36 PM AVI GROSS via Python-list
wrote:
>
> Agreed, Chris. There are many methods way better than the sort of RAID
> architecture I supplied as AN EXAMPLE easy to understand. But even so, if a
> hard disk or memory chip is fried or a nuclear bomb takes out all servers in
On Tue, Oct 24, 2023 at 8:43 PM Chris Angelico via Python-list
wrote:
>
> On Wed, 25 Oct 2023 at 12:20, AVI GROSS via Python-list
> wrote:
> > Consider an example of bit rot. I mean what if your CPU or hard disk has a
> > location where you can write a byte and read it back multiple times and
A post with useful ideas - - - - thanks (it generates some questions!
interleaved)
On Tue, Oct 24, 2023 at 8:35 PM Chris Angelico via Python-list
wrote:
>
> On Wed, 25 Oct 2023 at 12:11, Thomas Passin via Python-list
> wrote:
> > This doesn't mean that no program can ever be proven to halt, nor
On 10/24/2023 7:37 PM, Grant Edwards via Python-list wrote:
On 2023-10-24, Thomas Passin via Python-list wrote:
Something less ambitious than a full proof of correctness of an
arbitrary program can sometimes be achieved. The programming team
for the Apollo moon mission developed a system
, 2023 9:41 PM
To: python-list@python.org
Subject: Re: Question(s)
On Wed, 25 Oct 2023 at 12:20, AVI GROSS via Python-list
wrote:
> Consider an example of bit rot. I mean what if your CPU or hard disk has a
location where you can write a byte and read it back multiple times and
sometimes get the wr
On Wed, 25 Oct 2023 at 12:20, AVI GROSS via Python-list
wrote:
> Consider an example of bit rot. I mean what if your CPU or hard disk has a
> location where you can write a byte and read it back multiple times and
> sometimes get the wrong result. To be really cautions, you might need your
>
On Wed, 25 Oct 2023 at 12:11, Thomas Passin via Python-list
wrote:
> This doesn't mean that no program can ever be proven to halt, nor that
> no program can never be proven correct by formal means. Will your
> program be one of those? The answer may never come ...
Indeed, and I would go
: Re: Question(s)
On Tue, Oct 24, 2023 at 6:09 PM Thomas Passin via Python-list
wrote:
>
snip
>
> By now you have read many responses that basically say that you cannot
> prove that a given program has no errors, even apart from the hardware
> question. Even if it could be
On 10/24/2023 7:15 PM, o1bigtenor wrote:
On Tue, Oct 24, 2023 at 6:09 PM Thomas Passin via Python-list
wrote:
snip
By now you have read many responses that basically say that you cannot
prove that a given program has no errors, even apart from the hardware
question. Even if it could be
On 25/10/2023 00:08, o1bigtenor via Python-list wrote:
> So how does one test software then?
Testing is very different to proving!
As an industry we do a lot of testing at many different levels.
On bigger projects you'll find:
- Unit tests - testing small fragments of a bigger program
-
On 24/10/2023 22:51, Grant Edwards via Python-list wrote:
>>> Is there a way to verify that a program is going to do what it is
>>> supposed to do even before all the hardware has been assembled and
>>> installed and tested?
> And the specified customer requirements are usually wrong too. Sure,
>
On 2023-10-24, o1bigtenor via Python-list wrote:
> So how does one test software then?
That's what customers are for!
[Actually, that's true more often than it should be.]
--
https://mail.python.org/mailman/listinfo/python-list
On 2023-10-24, Thomas Passin via Python-list wrote:
> Something less ambitious than a full proof of correctness of an
> arbitrary program can sometimes be achieved. The programming team
> for the Apollo moon mission developed a system which, if you would
> write your requirements in a certain
On Tue, Oct 24, 2023 at 6:09 PM Thomas Passin via Python-list
wrote:
>
snip
>
> By now you have read many responses that basically say that you cannot
> prove that a given program has no errors, even apart from the hardware
> question. Even if it could be done, the kind of specification that you
On Tue, Oct 24, 2023 at 5:28 PM Rob Cliffe wrote:
>
> There is no general way to prove that a program is "correct". Or even
> whether it will terminate or loop endlessly.
> These are of course theoretical statements of computer science. But
> they can be rigorously proven. (Sorry if I'm just
On 10/24/2023 8:22 AM, o1bigtenor via Python-list wrote:
Greetings
(Sorry for a nebulous subject but dunno how to have a short title for
a complex question.)
I have been using computers for a long time but am only beginning my
foray into the
galaxy of programming. Have done little to this
On Tue, Oct 24, 2023 at 4:54 PM Grant Edwards via Python-list
wrote:
>
> On 2023-10-24, Dan Purgert via Python-list wrote:
> > On 2023-10-24, o1bigtenor wrote:
> >> Greetings
> >>
> >> (Sorry for a nebulous subject but dunno how to have a short title for
> >> a complex question.)
> >> [...]
> >>
> On 24 Oct 2023, at 18:25, o1bigtenor via Python-list
> wrote:
>
> Is there a way to verify that a program is going to do what it is
> supposed to do
In the general case not proven to be not possible.
Have a read about the halting problem
https://en.wikipedia.org/wiki/Halting_problem
It
On 2023-10-24, Dan Purgert via Python-list wrote:
> On 2023-10-24, o1bigtenor wrote:
>> Greetings
>>
>> (Sorry for a nebulous subject but dunno how to have a short title for
>> a complex question.)
>> [...]
>> Is there a way to verify that a program is going to do what it is
>> supposed to do
On 2023-10-24, o1bigtenor wrote:
> Greetings
>
> (Sorry for a nebulous subject but dunno how to have a short title for
> a complex question.)
> [...]
> Is there a way to verify that a program is going to do what it is
> supposed to do even
> before all the hardware has been assembled and installed
On 2023-10-24, o1bigtenor via Python-list wrote:
> Is there a way to verify that a program is going to do what it is
> supposed to do even before all the hardware has been assembled and
> installed and tested?
It depends on what you mean by "verify ...". If you want to prove a
program correct
I don’t think there i a simple answer to this, although if you find something
interesting, please share.
From my experience, industry is applying variety of testing methods. Starting
from lowest level components and implementing unit tests, finishing with
end-to-end testing platforms.
Lorenzo Catoni wrote:
Dear Python Mailing List members,
I am writing to seek your assistance in understanding an unexpected
behavior that I encountered while using the __enter__ method. I have
provided a code snippet below to illustrate the problem:
```
class X:
... __enter__ = int
...
ans
knowing there will be a first argument.
Avi
-Original Message-
From: Python-list On
Behalf Of Rob Cliffe via Python-list
Sent: Saturday, April 22, 2023 9:56 AM
To: Lorenzo Catoni ; python-list@python.org
Subject: Re: Question regarding unexpected behavior in using __enter__ method
This puzzled me at first, but I think others have nailed it. It is not
to do with the 'with' statement, but with the way functions are defined.
When a class is instantiated, as in x=X():
the instance object gets (at least in effect), as attributes,
copies of functions defined *in the
On 4/20/23 18:44, Lorenzo Catoni wrote:
Here, the TypeError occurred because "self" was passed as an input
Instantiate X and observe it there
x2 = X()
>>> X.__enter__
>>> X.__exit__
at 0x...>
>>> x2.__enter__
>>> x2.__exit__
of <__main__.X object at 0x...>>
To receive self the method
Thankyou for your answer,
i think i found the reason for this behavior, is has to do with the
function being user defined or not, rather than being a plain function or
type, as stated here
On 21/04/2023 00:44, Lorenzo Catoni wrote:
Dear Python Mailing List members,
I am writing to seek your assistance in understanding an unexpected
behavior that I encountered while using the __enter__ method. I have
provided a code snippet below to illustrate the problem:
```
class X:
...
On 21Apr2023 00:44, Lorenzo Catoni wrote:
I am writing to seek your assistance in understanding an unexpected
behavior that I encountered while using the __enter__ method. I have
provided a code snippet below to illustrate the problem:
```
class X:
... __enter__ = int
... __exit__ =
On 21/04/2023 10.44, Lorenzo Catoni wrote:
I am writing to seek your assistance in understanding an unexpected
behavior that I encountered while using the __enter__ method. I have
provided a code snippet below to illustrate the problem:
It is expected behavior - just not what WE might have
On Tue, Feb 7, 2023 at 7:35 PM Peter J. Holzer wrote:
>
> On 2023-02-07 17:58:26 -0500, Ivan "Rambius" Ivanov wrote:
> > I am trying to configure my loggers using dictConfig, but they do not
> > print anything. Here are more details.
> [...]
> > from myloggingconf import configure_logging
> >
> >
On 2023-02-07 17:58:26 -0500, Ivan "Rambius" Ivanov wrote:
> I am trying to configure my loggers using dictConfig, but they do not
> print anything. Here are more details.
[...]
> from myloggingconf import configure_logging
>
> logger = logging.getLogger(os.path.basename(__file__))
[...]
>
> def
On 1/8/2023 7:54 AM, Angitolol36 wrote:
Hello, i installed phyton in Windows 10 22H2 and i can’t find the program.
I used the repair that doesnt work.
This is as if you had said "I bought a car and it doesn't work". Please
tell us what you did and noticed that caused you to say "i
> On 8 Jan 2023, at 21:20, Angitolol36 wrote:
>
> Hello, i installed phyton in Windows 10 22H2 and i can’t find the program.
> I used the repair that doesnt work.
Does this help?
https://docs.python.org/3/using/windows.html
Barry
>
>
>
>
>
> Enviado desde [1]Correo para
On Sat, 10 Sept 2022 at 06:45, Dennis Lee Bieber wrote:
>
> On Thu, 8 Sep 2022 07:42:19 +1200, dn
> declaimed the following:
>
> >TSRs? Now that was an ugly period of history! (trying to make a
> >single-process operating system do multi-processing - only to find that
> >many program[me]s
On Sat, 10 Sept 2022 at 06:38, Greg Ewing wrote:
>
> On 8/09/22 6:57 am, Chris Angelico wrote:
> > Not as detrimental as starting with BASIC, and then moving on to x86
> > assembly language, and trying to massage the two together using CALL
> > ABSOLUTE in order to get mouse input in your
On Thu, 8 Sep 2022 07:42:19 +1200, dn
declaimed the following:
>TSRs? Now that was an ugly period of history! (trying to make a
>single-process operating system do multi-processing - only to find that
>many program[me]s assumed they had full use and undisputed control of
>the computer. Happy
writes:
> Maybe we should ask WHY the person asking the question about how to learn a
> computer language called Python is pairing it with the idea of whether to
> also learn C.
Excellent point!
--
https://mail.python.org/mailman/listinfo/python-list
On 8/09/22 6:57 am, Chris Angelico wrote:
Not as detrimental as starting with BASIC, and then moving on to x86
assembly language, and trying to massage the two together using CALL
ABSOLUTE in order to get mouse input in your GW-BASIC programs.
Or starting with hand-assembled SC/MP machine code
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