import ConfigParser as cp

def read_ini(filename, defaults):
    """
    import ConfigParser as cp

    params:
        filename: str    # config_file.ini
        defaults: dict   # uses for defaults and type-definition  

    result:
        results: dict    # results

    structure of defaults and results:
        {"section": {"option": typed_value,..} ,..}
    """
    
    if os.path.isfile(filename):

        config = cp.RawConfigParser()
        config.read(filename)
    
        dict_types = {int: config.getint, float: config.getfloat,
                      bool: config.getboolean,}
        
        for section in defaults:
            if config.has_section(section):
                dict_section = defaults[section]
                for option in dict_section:
                    if config.has_option(section, option):
                        try:
                            dict_section[option] = \
                              dict_types.get( \
                                  type(dict_section[option]), config.get) \
                                  (section, option)
                        except ValueError:
                            pass
    return defaults


defaults = {'main': {'number_size': 8, 'start_position': 4, 'latency': 25,
                     'finish_position': 7},
            }

read_ini(path_to_ini, defaults)