473,739 Members | 2,602 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

class question

Hello there,
i am pretty new to object-oriented programming and i have a question:
let's say i have a simple class such as:
class father:
age=...
name=....
def abcd.....
class son(father):
age=....
name=....
def efgh:
or any other heirarchic structure of class and subclasses.
i would like to list or print the data content of a given instance of the
subclass, all the way up (e.g. if sam is jack's son, so i would like to
get their names and ages and use the class as a data structure for that
matter).
how do i do this?
thanks,
t

Mar 17 '07 #1
1 1080
si*****@lkb.ens .fr wrote:
Hello there,
i am pretty new to object-oriented programming and i have a question:
let's say i have a simple class such as:
class father:
age=...
name=....
def abcd.....
class son(father):
age=....
name=....
def efgh:
or any other heirarchic structure of class and subclasses.
i would like to list or print the data content of a given instance of the
subclass, all the way up (e.g. if sam is jack's son, so i would like to
get their names and ages and use the class as a data structure for that
matter).
You misunderstand Python's classes. There is little, if any advantage
to defining a class inside another class.

How about:
import weakref # to keep everyone from being immortal.

class Person(object):
def __init__(self, age, name, dad=None, mom=None):
self.name = name
self.age = age
self.dad = dad
self.mom = mom
self._kids = weakref.WeakVal ueDictionary()
if dad is not None:
dad.add_kid(sel f)
if mom is not None:
mom.add_kid(sel f)

def children(self):
return self._kids.valu es()

def add_kid(self, child):
assert self.age child.age
self._kids[id(child)] = child

def __repr__(self):
return '%s(%s)' % (self.name, self.age)

guy = Person(age=28, name='George')
gal = Person(age=31, name='Martha')
kid = Person(age=1, name='Ellen', dad=guy, mom=gal)
print '%s of %s and %s.' % (kid, kid.dad, kid.mom)
print "%s's kids: %s." % (guy, guy.children())
print "%s's kids: %s." % (gal, gal.children())

--Scott David Daniels
sc***********@a cm.org
Mar 17 '07 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

20
2887
by: modemer | last post by:
Question is as in subject. For example: class BaseClass { public: void func() { do something; } // I don't want this function being overloaded in its inherited class };
0
1434
by: Sebastian Hiller | last post by:
Hello, i'm new to .Net (i'm using VB as language and i'm working in the code-behind mode) and i can't solve the following problem: I have a WebForm and want to Add a UserControl (classname:QuestionControl) as many times as there are rows in a DataTable (also named Questions) in a DataSet. But this UserControl is ,for reasons of structuring, not a member of the WebForm Object in which it should be displayed, it is member of another class...
2
253
by: Sebastian Hiller | last post by:
Hello, i'm new to .Net (i'm using VB as language and i'm working in the code-behind mode) and i can't solve the following problem: I have a WebForm and want to Add a UserControl (classname:QuestionControl) as many times as there are rows in a DataTable (also named Questions) in a DataSet. But this UserControl is ,for reasons of structuring, not a member of the WebForm Object in which it should be displayed, it is member of another class...
2
315
by: Sebastian Hiller | last post by:
Hello, i'm new to .Net (i'm using VB as language and i'm working in the code-behind mode) and i can't solve the following problem: I have a WebForm and want to Add a UserControl (classname:QuestionControl) as many times as there are rows in a DataTable (also named Questions) in a DataSet. But this UserControl is ,for reasons of structuring, not a member of the WebForm Object in which it should be displayed, it is member of another class...
2
1314
by: Sebastian Hiller | last post by:
Hello, i'm new to .Net (i'm using VB as language and i'm working in the code-behind mode) and i can't solve the following problem: I have a WebForm and want to Add a UserControl (classname:QuestionControl) as many times as there are rows in a DataTable (also named Questions) in a DataSet. But this UserControl is ,for reasons of structuring, not a member of the WebForm Object in which it should be displayed, it is member of another class...
0
8792
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
9479
Oralloy
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...
0
9337
jinu1996
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...
1
9266
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,...
0
8215
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
6754
isladogs
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...
0
6054
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
1
3280
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
3
2193
bsmnconsultancy
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...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.