Import and Inheritance Problem

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June 11th, 2003, 05:10 AM

HarryF

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Import and Inheritance Problem

I've got two classes in seperate files, the Goodbye class being a subclass of Hello;

Code:

#Hello.py

class Hello:
    def __init__(self):
        self.msg = "Hello World!"
    def getMsg(self):
        return self.msg

Code:

#Goodbye.py
import Hello

class Goodbye(Hello):
    def __init__(self):
        self.msg = "Goodbye World!"

Now trying to use these classes in another script;

Code:

import Hello
import Goodbye

hello = Hello.Hello()
print hello.getMsg()

goodbye = Goodbye.Goodbye()
print goodbye.getMsg()

The first call print hello.getMsg() works fine, displaying "Hello World!"

Instantiating the Goodbye class results in a type error; "Module "object" is not callable"

Hope someone can put me right here.

Many thanks

June 11th, 2003, 05:42 AM

netytan

Hello World :)

Join Date: Mar 2003

Location: Hull, UK

Posts: 2,529

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Reputation Power: 63

Subclass

Hi HarryF,

Solved your problem, You missed out the Hello. when you subclassed Hello.Hello()

, easily done. Goodbye.py should read -

Code:

#Goodbye.py
import Hello

class Goodbye(Hello.Hello):
    def __init__(self):
        self.msg = "Goodbye World!"

Hope this helps,

Mark.

June 11th, 2003, 06:15 AM

HarryF

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Awesome! Obvious now you point it out. Many thanks.

June 12th, 2003, 08:55 AM

lazy_yogi

Contributing User

Join Date: Mar 2003

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Re: Subclass

or you could just use
from Hello imprt *

Code:

#Goodbye.py
from Hello imprt *

class Goodbye(Hello):
    def __init__(self):
        self.msg = "Goodbye World!"

June 14th, 2003, 10:40 AM

netytan

Hello World :)

Join Date: Mar 2003

Location: Hull, UK

Posts: 2,529

Time spent in forums: 1 Week 2 Days 17 h 19 m 5 sec
Reputation Power: 63

from Hello import but this really isn't a good coding practive when it comes to calling objects. It's just a personal preferance but I only ever use import, it helps to see where your calling from if you ask me.

Mark.

June 14th, 2003, 11:04 AM

lazy_yogi

Contributing User

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Good point ... never though of it that way.

Cheers

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