如何在python中定义没有默认值的类属性

Question

I'm a C# developer learning python.

If I want to define a class with certain attributes, but not provide default values for the attributes, how is that done?

For example (this is my best guess of how to do it):

class Spam
    eggs = None
    cheese = None

Or, is this legal:

class Spam
    eggs
    cheese

Or something else?

Answer 1

You don't. You assign to the attributes later on, or set them to None .

An attribute without a value is not an attribute. Being dynamic, it's perfectly fine to assign the attribute later on without having to declare it in the class.