use classmethod to create a instance instead of staticmethod for more idiomatic python code

[fishronsage]

Currently, the codebase uses staticmethod as an alternate constructor. However, I believe that in the Python world, using classmethod is more idiomatic. staticmethod is typically used for utility functions that logically belong to the class.

https://docs.python.org/3/library/functions.html#staticmethod

Static methods in Python are similar to those found in Java or C++. Also, see classmethod() for a variant that is useful for creating alternate class constructors.

and some refers:

• https://stackoverflow.com/questions/136097/what-is-the-difference-between-staticmethod-and-classmethod-in-python
• https://stackoverflow.com/questions/75379715/python-creating-a-class-instance-via-static-method-vs-class-method
• https://www.reddit.com/r/learnpython/comments/15m7kkq/is_staticmethod_really_used/

(not saying staticmethod is wrong, just want to be more idiomatic 😄😁)