Load parameters with default values in an elegant way in Python

load_parameters_with_default_values_in_an_elegant_way_in_python.py

import csv


class CustomCSVReader:
    _CSV_DEFAULT_PARS = {
        "delimiter": ",",
        "doublequote": True,
        "escapechar": None,
        "lineterminator": "\r\n",
        "quotechar": '"',
        "quoting": csv.QUOTE_MINIMAL,
        "skipinitialspace": False,
        "strict": False,
    }
    
    def __init__(self, csv_file: str, custom_csv_par: str, **kwargs):
        """
        :param kwargs: passing any parameter of Python's csv.reader as keyword parameter
        """
        
        self.custom_csv_par = custom_csv_par
        
        # Load the default parameters for csv reader and update it with parameters passed in
        # Then we will have full parameters of csv.reader with custom values if passed in and all default values
        self.csv_pars = {
                **self._CSV_DEFAULT_PARS,
                **{k: kwargs[k] for k in set(kwargs).intersection(self._CSV_DEFAULT_PARS)},
            }
        
        print("Reading CSV file with parameter:")
        print(self.csv_pars)
        
        csv.reader(csvfile, **self.csv_pars)