`unicode`` object,
        or an iterator of lines such as a filehandle, (each line is either a
        ``str`` or ``unicode``)
    :param max_blocks: int, optional (Default: ``None``, no limit)
        The maximum number of blocks to parse from the input.
    :param allow_empty_author: bool, optional (Default: `False`),
        Whether to allow an empty author in the trailer line of a change
        block.
    :param strict: bool, optional (Default: ``False``, use a warning)
        Whether to raise an exception if there are errors.
    :param encoding: str,
        If the input is a str or iterator of str, the encoding to use when
        interpreting the input.

    There are a number of errors that may be thrown by the module:

    - :class:`ChangelogParseError`:
      Indicates that the changelog could not be parsed, i.e. there is a line
      that does not conform to the requirements, or a line was found out of
      its normal position. May be thrown when using the method
      `parse_changelog`.
      The constructor will not throw this exception.
    - :class:`ChangelogCreateError`:
      Some information required to create the changelog was not available.
      This can be thrown when `str()` is used on the object, and will occur
      if a required value is `None`.
    - :class:`VersionError`:
      The string used to create a Version object cannot be parsed as it
      doesn't conform to the specification of a version number. Can be
      thrown when creating a Changelog object from an existing changelog,
      or instantiating a Version object directly to assign to the version
      attribute of a Changelog object.

    If you have a changelog that may have no author information yet as
    it is still a work in progress, i.e. the author line is just::

        --

    rather than::

        -- Author <author@debian.org>  Thu, 12 Dec 2006 12:23:34 +0000

    then you can pass ``allow_empty_author=True`` to the Changelog
    constructor. If you do this then the ``author`` and ``date``
    attributes may be ``None``.

    NFr*