def __init__(self):
    """Initialize the default settings for WhintPy library.

    Sets default values for folder and file name separators, as well as
    restrictions on file name lengths and characters. After initialization,
    the settings are frozen to prevent modifications unless explicitly
    unfrozen.

    """
    self.__dict__ = dict(FOLDER_NAME_SEPARATOR='.', FIELDS_NAME_SEPARATOR='_', MIN_FILE_NAME_LENGTH=4, INVALID_CHARS_FOR_FOLDERS='/\\.$@#%&*()[]{}<>:;,?"\'`!^+=|~', INVALID_CHARS_FOR_FIELDS='/$@#%&*()[]{}<>:;,?"\'`!^+=|~', DOWNLOADS_FILENAME='downloads.txt', DESCRIPTION_FILENAME='description.txt')
    self._is_frozen = True

def freeze(self):
    """Freeze the settings to make them immutable.

        Once frozen, any attempt to modify or delete attributes will raise
        an AttributeError.

        """
    super().__setattr__('_is_frozen', True)

def unfreeze(self):
    """Unfreeze the settings, allowing temporary modifications.

        This allows attributes to be modified, but should be used with care.

        """
    super().__setattr__('_is_frozen', False)

def __setattr__(self, key, value):
    """Override the default behavior to prevent attribute modification when frozen.

        :param key: The attribute name.
        :param value: The new value to set for the attribute.
        :raises: AttributeError: If the class is frozen and an attempt is made to set an attribute.

        """
    if getattr(self, '_is_frozen', False):
        raise AttributeError(f'{self.__class__.__name__} object is immutable')
    super().__setattr__(key, value)

def __delattr__(self, key):
    """Override the default behavior to prevent deletion of attributes.

        :param key: The attribute name.
        :raises: AttributeError: Always raised since attribute deletion is not allowed.

        """
    raise AttributeError(f'{self.__class__.__name__} object does not allow attribute deletion')

def __enter__(self):
    """Override to allow the support the 'with' statement.

        To be used for temporary settings changes.
        :return: the object itself for use in 'with' blocks.

        """
    return self

def __exit__(self, exc_type, exc_value, traceback):
    """Context manager exit method, no specific handling required.

        This ensures that when exiting a 'with' block, the settings remain unchanged.

        :param exc_type: The exception type.
        :param exc_value: The exception value.
        :param traceback: The traceback.

        """
    pass

def __iter__(self):
    """Iterate over the settings attributes.

        This allows iterating through all configuration settings, providing access to each key.

        :return: An iterator over the dictionary keys.

        """
    for item in self.__dict__.keys():
        yield item