how_not_to_use_param_class.py

from my_project_params import Params

class SomeMidProcessModule:
    def __init__(self, params: Params = None):
        self.params: Params = params or Params()  # NO! BAD! if we don't input an instace of Params, 
                                                  # we will create a new instance with only default values.
    
    def run(self):
        do_somaething(self.params.some_configurable_value)