Re: [Tutor] @property for old style classes vs new style classes

I figured out why you have var in instance __dict__. It was after you added it. But why var is in class __dict__? Does @property make it a class attribute? Thank you Monika -- Original Message -- From: Steven D'Aprano To: tutor@python.org Subject: Re:

Re: [Tutor] @property for old style classes vs new style classes

For both old and new classes I have var only in GetSet class, but not in instance me. Why? print me.__dict__ print GetSet.__dict__ {'attrval': 5} {'__weakref__': , '__doc__': None, '__module__': '__main__', '__init__': , '__dict__': , 'var': } >>> Thank you very much Monika --

Re: [Tutor] @property for old style classes vs new style classes

Thank you both for your explanations but they were too difficult for me to understand. What is descriptor protocol? Can you please explain? I checked for var in both instance and class __dict__ but it was only in class, not in the instance. I checked for it after I instantiated me, before

Re: [Tutor] global interpreter lock

Basically, what that said is the global interpreter lock is something that allows only one thread at a time to be executed when you launch a python program in opposition of executing multiple threads at the same time (parallelism). when you launch a python program it create a process in memory.

Re: [Tutor] global interpreter lock

> Can someone explain global interpreter lock with some source code examples? Watch this youtube video. Gilectomy https://www.youtube.com/watch?v=fgWUwQVoLHo -- Joaquin This email is confidential and may be subject to privilege. If you are not the intended recipient, please do not copy or

Re: [Tutor] @property for old style classes vs new style classes

On Thu, Sep 15, 2016 at 04:40:22AM +, monik...@netzero.net wrote: > Could somebody please explain what is going on for old style classes for the > below code: The important part is that the descriptor protocol doesn't get used for old style classes. If that statement means something to

Re: [Tutor] @property for old style classes vs new style classes

On Thu, Sep 15, 2016 at 02:08:12PM +, eryk sun wrote: > Getting attributes also prefers the instance dict. However, to support > bound methods (e.g. __init__), it falls back on a class lookup and > calls the descriptor __get__ method if defined. Is that documented anywhere? When was it

Re: [Tutor] @property for old style classes vs new style classes

On Thu, Sep 15, 2016 at 4:40 AM, monik...@netzero.net wrote: > class GetSet(): > > def __init__(self, value): > self.attrval = value > > @property > def var(self): > print "getting the var attribute" > return self.attrval > @var.setter

Re: [Tutor] automatic setting of class property when another one changes

On Thu, Sep 15, 2016 at 12:30:34PM +0200, ingo wrote: > Rather stuck with this one, I'd like to automatically (re)set the > propery "relaystate" when one of the others (Tm, Tset, Th) is set, > regardless of wether their value has changed. The obvious way is to make Tm, etc properties, and have

Re: [Tutor] automatic setting of class property when another one changes

ingo wrote: > Rather stuck with this one, I'd like to automatically (re)set the > propery "relaystate" when one of the others (Tm, Tset, Th) is set, > regardless of wether their value has changed. The easiest way to achieve your goal seems to be a read-only property: # this creates a class that

[Tutor] automatic setting of class property when another one changes

Rather stuck with this one, I'd like to automatically (re)set the propery "relaystate" when one of the others (Tm, Tset, Th) is set, regardless of wether their value has changed. Ingo My code so far: from collections import namedtuple import logging logger = logging.getLogger()

[Tutor] @property for old style classes vs new style classes

Hi: Im studying @property, @var.setter and @var.deleter. I understand how they work in new style classes. Even though I do not use old style classes it would be interesting to understand what is going on behind the scenes. I can try to make assumptions but I do not want to because they might

[Tutor] global interpreter lock

Can someone explain global interpreter lock with some source code examples? I didn't understand explanation offered here: https://docs.python.org/3/glossary.html#term-global-interpreter-lock ___ Tutor maillist - Tutor@python.org To unsubscribe or