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#1
April 9th, 2004, 04:52 AM
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How to create a list of objects
Suppose I have a class Module.class
I want to create a list of objects, so I do list = [] foreach ... myinst = Module.class() list.append(myinst) foreach obj in list: obj.doSomething() Is there a problem with this?
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#2
April 9th, 2004, 06:35 AM
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No problem at all, except that you need to change 'foreach' to 'for'. You will also need to change some of the names, since 'class' is a reserved word and 'list' is the name of a builtin type.
The basic concept is sound though. Lists can hold any type of object, including class instances. Dave - The Developers' Coach
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#3
April 12th, 2004, 10:27 PM
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In an effort to stay intouch during my travels heres an example
 ...Code:
objects = [] for each in range(10): objects.append(module.Class) This is about as basic as youre going to get; note the capital at the beginning of class. this is done to avoid the problems of key words in names as coach staited. Anyway you should end up with a list 'objects' with 10 new instances of module.Class in it. It may also be possiable for you to do something like this... Code:
objects = [] objects.append(module.Class) * 10 Note: As i can't test anything right now no promises. You might end up with a list containting referances to the same instance (not what you want). You can also do the same thing in less space using list comprehensions in Python 2.3+. Code:
objects = [module.Class for each in range(10)] Hope you find this of some help... Mark.
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#4
April 13th, 2004, 04:51 AM
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Quote:
Mark, you forgot to call the Class object to create an instance. The code creates a list of class objects instead of class instances. The correct code is: Code:
objects = [] for each in range(10): objects.append(module.Class()) #or objects = [module.Class() for each in range(10)] The second example you gave: Code:
objects = [] objects.append(module.Class) * 10 Doesn't work at all. Regards, Dave - The Developers' Coach
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#5
April 13th, 2004, 11:46 AM
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Hehehhe, damn. Totaly missed that, your right this is only storing the object not an instance of this. Guess thats what you get for not testing stuff out - unfortunatly nothing i can really do about that right now so.
The reason i included the * 10 bit was i was half remembering a post from a few months ago where * was used to populate a list and or dict i believe. Although i since remcalled it was more like this and didnt work anyway .Code:
objects = [module.Class()] * 10 Note: again, untested. Can you tell its been a while? LOL, i should try and get on more but since i'm traveling atm i have to go to these cyber cafes and that costs  Anyway take care, Mark.
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#6
April 13th, 2004, 12:10 PM
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Quote:
You are right, it doesn't work, at least not in the way that the original poster wants. Instead of making a list with ten different objects, it will make a list with ten instances of the same object. Enjoy your holiday, Mark (unless you are working, in which case enjoy that instead). Dave - The Developers' Coach
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#7
April 13th, 2004, 12:15 PM
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Thanks Dev, am trying my hardest to keep up with you guys bit not enough time and def not enough money. This is kinda a working holiday though so, will have a job at some point
 . Laters mate, Mark.
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