Python类返回多个实例

Question

I'm musing over the design of a class. Currently, I have a list comprehension over a list of data that instantiates an instance of the class on each member of the list, thus returning me a list of instances of my class.

Would it be better, or indeed possible, to have instead a class method that takes a list and returns a list of instances?

Essentially, I'm wondering, would:

data = [lots of data]
[MyClass(point) for point in data]

or

@classmethod
def from_list(cls, data_list):
    return [cls(point) for point in data_list]

be better/more pythonic? If it matters, in the usage I intend, I will always be instantiating the class from a list of data.

Answer 1

As it stands, there isn't much to choose between them. However, the @classmethod has one major plus point; it is available to subclasses of MyClass . This is far more Pythonic than having separate functions for each type of object you might instantiate in a list.

Answer 2

I would argue that the first method would be better (list comprehension) since you will always be initializing the data from a list. This makes things explicit.