Alternative two-arg dict constructor method

constructor_dict.py

import numpy as np

# Base class
class Base:
    # Dict for creating instances with common data values
    init_dict = {
        'type_1': np.eye(3),
        'type_2': np.random.random((4, 4))**0.5,
        'type_3': np.linalg.inv(np.random.random((3, 3)))
    }

    # Two args to ensure differentiation
    # Could add error checking if they're both None if you really want
    # Put the more commonly used argument first if the keyword isn't provided
    def __init__(self, default_type=None, value=None):
        if default_type is not None:
            try:
                self.data = Base.init_dict[default_type]
            except KeyError:
                print(f"{default_type} is not a defined value in {Base.init_dict}")
                raise
        elif value is not None:
            self.data = value

    def some_method(self):
        pass

    def some_other_method(self):
        pass

# Creating three common instances
v1 = Base('type_1')
v2 = Base('type_2')
v3 = Base('type_3')
# Creating another instance
v_other = Base(value=np.zeros((3, 3)))