parameters: (name, extensions, function, extra_args=None,
  
                             description='')
docstring: Registers an unpack format.
  
  
  
      `name` is the name of the format. `extensions` is a list of extensions
  
      corresponding to the format.
  
  
  
      `function` is the callable that will be
  
      used to unpack archives. The callable will receive archives to unpack.
  
      If it's unable to handle an archive, it needs to raise a ReadError
  
      exception.
  
  
  
      If provided, `extra_args` is a sequence of
  
      (name, value) tuples that will be passed as arguments to the callable.
  
      description can be provided to describe the format, and will be returned
  
      by the get_unpack_formats() function.
docstring_summary: Registers an unpack format.
docstring_tokens: Registers an unpack format .
function: def register_unpack_format(name, extensions, function, extra_args=None,
  
                             description=''):
  
      """Registers an unpack format.
  
  
  
      `name` is the name of the format. `extensions` is a list of extensions
  
      corresponding to the format.
  
  
  
      `function` is the callable that will be
  
      used to unpack archives. The callable will receive archives to unpack.
  
      If it's unable to handle an archive, it needs to raise a ReadError
  
      exception.
  
  
  
      If provided, `extra_args` is a sequence of
  
      (name, value) tuples that will be passed as arguments to the callable.
  
      description can be provided to describe the format, and will be returned
  
      by the get_unpack_formats() function.
  
      """
  
      if extra_args is None:
  
          extra_args = []
  
      _check_unpack_options(extensions, function, extra_args)
  
      _UNPACK_FORMATS[name] = extensions, function, extra_args, description
function_tokens: def register_unpack_format ( name , extensions , function , extra_args = None , description = '' ) : if extra_args is None : extra_args = [ ] _check_unpack_options ( extensions , function , extra_args ) _UNPACK_FORMATS [ name ] = extensions , function , extra_args , description