class-variables Questions
4
Solved
I'm learning about classes and don't understand this:
class MyClass:
var = 1
one = MyClass()
two = MyClass()
print(one.var, two.var) # out: 1 1
one.var = 2
print(one.var, two.var) # out: 2 1
I...
Shenitashenk asked 5/11, 2021 at 17:9
7
Solved
I am working on a method to return all the class variables as keys and values as values of a dictionary , for instance i have:
first.py
class A:
a = 3
b = 5
c = 6
Then in the second.py i sho...
Herbertherbicide asked 24/1, 2014 at 0:36
7
Solved
I need to make a bunch of class variables and I would like to do it by looping through a list like that:
vars = ('tx', 'ty', 'tz') # plus plenty more
class Foo():
for v in vars:
setattr(no_idea_...
Harcourt asked 29/11, 2011 at 8:11
27
Solved
How do I create class (i.e. static) variables or methods in Python?
Gambrill asked 16/9, 2008 at 1:46
6
Solved
If I have the following code:
class Foo(object):
bar = 1
def bah(self):
print(bar)
f = Foo()
f.bah()
It complains
NameError: global name 'bar' is not defined
How can I access class/static ...
Continent asked 1/4, 2009 at 21:23
5
Solved
Suppose I have this code:
class Example(object):
def the_example(self):
itsProblem = "problem"
theExample = Example()
print(theExample.itsProblem)
When I try it, I get an error ...
Kazoo asked 8/8, 2010 at 14:2
3
Solved
this is my first question, so sorry...
I'm a beginner with python and coding in general, and i wanted to create a class called 'Map' that would have the following class variables:
class Map:
hei...
Sirius asked 25/5, 2015 at 19:38
1
How can I handle the validation of an array of numbers in form data?
Because I am passing data in a form-data format, I can't validate an array of numbers Actually, I don't know how to do it.
This...
Bastian asked 23/9, 2021 at 19:58
8
Solved
I read When do Ruby instance variables get set? but I'm of two minds when to use class instance variables.
Class variables are shared by all objects of a class, Instance variables belong to one obj...
Tilth asked 2/4, 2013 at 20:17
4
Solved
I'm working as an application with classes and subclasses. For each class, both super and sub, there is a class variable called label. I would like the label variable for the super class to default...
Fourier asked 21/5, 2015 at 18:49
4
Solved
Why are Java constants declared static?
class Foo {
static final int FII = 2 ;
}
In this example I understand the use of final, But why does it have to be static? Why should it be a class variabl...
Nebiim asked 11/11, 2011 at 11:21
4
Solved
I have a class with a static var where the current online connection status is stored. I want to observe the value of ConnectionManager.online through other classes. I wanted to do this with KVO, b...
Theotokos asked 6/7, 2016 at 22:34
6
Solved
I'm working on extending the Python webapp2 web framework for App Engine to bring in some missing features (in order to make creating apps a little quicker and easier).
One of the requirements her...
Pose asked 26/2, 2014 at 15:47
1
Solved
Given the class
from __future__ import annotations
from typing import ClassVar, Dict, Final
import abc
class Cipher(abc.ABC):
@abc.abstractmethod
def encrypt(self, plaintext: str) -> s...
Lolalolande asked 25/12, 2019 at 0:33
2
Solved
According to Reek, creating a class variable is considered a 'code smell'. What is the explanation behind this?
Sherrill asked 26/11, 2016 at 13:55
4
Solved
I know it supports automatic variables, but what about class variables?
Duffy asked 25/6, 2012 at 10:26
3
Solved
Can anyone tell me about the difference between class variables and class instance variables?
Unijugate asked 27/9, 2010 at 9:32
9
Solved
What is the difference between up-casting and down-casting with respect to class variable?
For example in the following program class Animal contains only one method but Dog class contains two met...
Caracole asked 1/5, 2014 at 18:30
5
Solved
I've been programming in Ruby for a few months now, and I'm wondering when it is appropriate to use constants over class variables and vice versa. (I'm working in Rails, thinking about constants in...
Singularity asked 22/12, 2008 at 22:16
5
Solved
What are Ruby variables preceded with double at signs (@@)? My understanding of a variable preceded with an at sign is that it is an instance variable, like this in PHP:
PHP version
class Person ...
Pushkin asked 4/5, 2011 at 21:33
2
Solved
I am having problem getting this piece of code to run. The class is Student which has a IdCounter, and it is where the problem seems to be. (at line 8)
class Student:
idCounter = 0
def __init__(...
Marlow asked 4/4, 2012 at 5:22
2
Solved
I want to create somekind of event system in c++ for my needs
I know that you can use fuction as other function parameter
May be i missed something(But in c# you can do it with events handlers)
Credo asked 17/6, 2018 at 6:22
1
I've seen threads like this on thread-safety in Rails and various web pages on the topic, and I'm sure everyone's great at reciting what it is and giving 'tips' on what isn't thread-safe ("class va...
Extracurricular asked 26/7, 2016 at 10:39
6
Solved
First, a puzzle:
What does the following code print?
public class RecursiveStatic {
public static void main(String[] args) {
System.out.println(scale(5));
}
private static final long X = scal...
Figone asked 19/3, 2018 at 14:56
8
Solved
If I have an instance in PHP, what's the easiest way to get to a static property ('class variable') of that instance ?
This
$classvars=get_class_vars(get_class($thing));
$property=$classvars['pro...
Strung asked 11/4, 2011 at 15:43
1 Next >
© 2022 - 2025 — McMap. All rights reserved.