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by: Gabriel Genellina |
last post by:
Hi
In the following code sample, I have:
- a Worker class, which could have a lot of methods and attributes. In
particular, it has a 'bar' attribute. This class can be modified as needed.
- a Base class (old-style) which defines a default class attribute 'bar'
too. I can't modify the source code of this class. Note that Workes does
not inherit from Base.
- a Derived class which must inherit from Base and is a wrapper around
Worker: it...
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by: Andre Meyer |
last post by:
Hi all
I have been searching everywhere for this, but have not found a
solution, yet.
What I need is to create an object that is an instance of a class (NOT a
class instance!) of which I only know the name as a string. This what I
tried:
class A:
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by: Neil Zanella |
last post by:
Hello,
I would like to know whether it is possible to define static class methods
and data members in Python (similar to the way it can be done in C++ or Java).
These do not seem to be mentioned in "Learning Python" by Mark Lutz and David
Ascher. It seems like they are a relatively new feature... It seems to me that
any truly OO programming language should support these so I'm sure that Python
is no exception, but how can these be...
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by: Dan Perl |
last post by:
There is something with initializing mutable class attributes that I am
struggling with. I'll use an example to explain:
class Father:
attr1=None # this is OK
attr2= # this is wrong
def foo(self, data):
self.attr1=data
self.attr2.append(data)
The initialization of attr1 is obviously OK, all instances of Father
redefine it in the method foo. But the initialization of attr2 is wrong
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by: John M. Gabriele |
last post by:
I've done some C++ and Java in the past, and have recently learned
a fair amount of Python. One thing I still really don't get though
is the difference between class methods and instance methods. I
guess I'll try to narrow it down to a few specific questions, but
any further input offered on the subject is greatly appreciated:
1. Are all of my class's methods supposed to take 'self' as their
first arg?
2. Am I then supposed to call...
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by: Graham |
last post by:
This has to do with class variables and instances variables.
Given the following:
<code>
class _class:
var = 0
#rest of the class
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by: Jamey Shuemaker |
last post by:
I'm in the process of expanding my knowledge and use of Class Modules.
I've perused MSDN and this and other sites, and I'm pretty comfortable
with my understanding of Class Modules with the exception of custom
Collection Classes.
Background: I'm developing an A2K .mdb to be deployed as an .mde at my
current job-site. It has several custom controls which utilize custom
classes to wrap built-in controls, and add additional functionality....
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by: titan nyquist |
last post by:
I have a class with data and methods that use it. Everything is
contained perfectly
THE PROBLEM: A separate thread has to call a method in the current
instantiation of this class. There is only ever ONE instantiation of
this class, and this outside method in a separate thread has to access
it.
How do i do this?
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by: tshad |
last post by:
Using VS 2003, I am trying to take a class that I created to create new
variable types to handle nulls and track changes to standard variable types.
This is for use with database variables. This tells me if a variable has
changed, give me the original and current value, and whether the current
value and original value is/was null or not.
This one works fine but is recreating the same methods over and over for
each variable type.
...
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by: Steven D'Aprano |
last post by:
I have a class which is not intended to be instantiated. Instead of using
the class to creating an instance and then operate on it, I use the class
directly, with classmethods. Essentially, the class is used as a function
that keeps state from one call to the next.
The problem is that I don't know what to call such a thing! "Abstract
class" isn't right, because that implies that you should subclass the
class and then instantiate the...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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