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POpython list/dict property best practice
 

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    <p>I have a class object that stores some properties that are lists of other objects. Each of the items in the list has an identifier that can be accessed with the <code>id</code> property. I'd like to be able to read and write from these lists but also be able to access a dictionary keyed by their identifier. Let me illustrate with an example:</p> <pre><code>class Child(object): def __init__(self, id, name): self.id = id self.name = name class Teacher(object): def __init__(self, id, name): self.id = id self.name = name class Classroom(object): def __init__(self, children, teachers): self.children = children self.teachers = teachers classroom = Classroom([Child('389','pete')], [Teacher('829','bob')]) </code></pre> <p>This is a silly example, but it illustrates what I'm trying to do. I'd like to be able to interact with the classroom object like this:</p> <pre><code>#access like a list print classroom.children[0] #append like it's a list classroom.children.append(Child('2344','joe')) #delete from like it's a list classroom.children.pop(0) </code></pre> <p>But I'd also like to be able to access it like it's a dictionary, and the dictionary should be automatically updated when I modify the list:</p> <pre><code>#access like a dict print classroom.childrenById['389'] </code></pre> <p>I realize I could just make it a dict, but I want to avoid code like this:</p> <pre><code>classroom.childrendict[child.id] = child </code></pre> <p>I also might have several of these properties, so I don't want to add functions like <code>addChild</code>, which feels very un-pythonic anyway. Is there a way to somehow subclass dict and/or list and provide all of these functions easily with my class's properties? I'd also like to avoid as much code as possible.</p>
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    1. COHow about `classroom.childrenBy('Id')['389']` or something like that?
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    2. COThat could work, but I'd still have to define a childrenBy method for every property, and then I'd have to do a linear search through the children list to find the id that matches. I'd like to update the dictionary when the list changes.
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    3. COWhen you said "I also might have several of these properties", I thought you meant several properties like `id`. Did you mean several properties like `children`? If so, could you have `classroom.ById('Child')['389']`?
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