config.ini

[MYSQL]
HOST = 127.0.0.1
USERNAME = mysql_root
PASSWORD = mysql_password
PORT = 3306
DATABASE = MYSQL_DATA
    
[MSSQL]
SERVER = test.database.windows.net
USERNAME = mssql_root
PASSWORD = mssql_password
DATABASE = MSSQL_DATA

config.toml

[DB_INFO]

    [DB_INFO.MYSQL]
        HOST = '127.0.0.1'
        USERNAME = 'mysql_root'
        PASSWORD = 'mysql_password'
        PORT = 3306
        DATABASE = 'MYSQL_DATA'
        
    [DB_INFO.MSSQL]
        SERVER = 'test.database.windows.net'
        USERNAME = 'mssql_root'
        PASSWORD = 'mssql_password'
        DATABASE = 'MSSQL_DATA'    

config.yaml

DB_INFO:
  MYSQL:
    HOST: 127.0.0.1
    USERNAME: mysql_root
    PASSWORD: mysql_password
    PORT: 3306
    DATABASE: MYSQL_DATA
  MSSQL:
    SERVER: test.database.windows.net
    USERNAME: mssql_root
    PASSWORD: mssql_password
    DATABASE: MSSQL_DATA

read_ini.py

import configparser

def read_ini(filepath):
    config = configparser.ConfigParser()
    config.read(filepath)
    return config

ini_config = read_ini('config.ini')
mysql_info = ini_config['MYSQL']

host = mysql_info['HOST']
username = mysql_info['USERNAME'] 
port = mysql_info['PORT']

# host: 127.0.0.1 (str)
# username: mysql_root (str)
# port: 3306 (str)

read_toml.py

import tomllib

def read_toml(filepath):
    with open(filepath, "rb") as f:
        config = tomllib.load(f)
    return config

toml_config = read_toml('config.toml')
mysql_info = toml_config['DB_INFO']['MYSQL']

host = mysql_info['HOST']
username = mysql_info['USERNAME'] 
port = mysql_info['PORT']

# host: 127.0.0.1 (str)
# username: mysql_root (str)
# port: 3306 (int)

read_yaml.py

import yaml

def read_yaml(filepath):
    with open(filepath) as f:
        config = yaml.safe_load(f)
    return config

yaml_config = read_yaml('config.yaml')
mysql_info = yaml_config['DB_INFO']['MYSQL']

host = mysql_info['HOST']
username = mysql_info['USERNAME'] 
port = mysql_info['PORT']

# host: 127.0.0.1 (str)
# username: mysql_root (str)
# port: 3306 (int)