9. Classes

9. Classes¶ Classes provide a means of bundling data and functionality together. Creating a new class creates a new type of object, allowing new instances of that type to be made. Each class instance can have attributes attached to it for maintaining its state. Class instances can also have methods (defined by its class) for modifying its state. Compared with other programming languages, Python’s

[hnishi2509]

よく、メソッドの最初の引数を self と呼びます。この名前付けは単なる慣習でしかありません。 self という名前は、 Python では何ら特殊な意味を持ちません。

[hujuu]

“class Complex: ... def __init__(self, realpart, imagpart): ... self.r = realpart ... self.i = imagpart ... >>> x = Complex(3.0, -4.5) >>> x.r, x.i”

[kawacho]

継承

[zorio]

MyClass.i and MyClass.f are valid attribute references, returning an integer and a function object, respectively. Class attributes can also be assigned to, so you can change the value of MyClass.i by assignment. __doc__ is also a valid attribute, returning the docstring belonging to the class: "A si