def get_guest_os_type(self, id_p):
        """Returns an object describing the specified guest OS type.
        
        The requested guest OS type is specified using a string which is a
        mnemonic identifier of the guest operating system, such as
        "win31" or "ubuntu". The guest OS type ID of a
        particular virtual machine can be read or set using the
        :py:func:`IMachine.os_type_id`  attribute.
        
        The :py:func:`IVirtualBox.guest_os_types`  collection contains all
        available guest OS type objects. Each object has an
        :py:func:`IGuestOSType.id_p`  attribute which contains an identifier of
        the guest OS this object describes.
        
        While this function returns an error for unknown guest OS types, they
        can be still used without serious problems (if one accepts the fact
        that there is no default VM config information).

        in id_p of type str
            Guest OS type ID string.

        return type_p of type :class:`IGuestOSType`
            Guest OS type object.

        raises :class:`OleErrorInvalidarg`
            @a id is not a valid Guest OS type.
        
        """
        if not isinstance(id_p, basestring):
            raise TypeError("id_p can only be an instance of type basestring")
        type_p = self._call("getGuestOSType",
                     in_p=[id_p])
        type_p = IGuestOSType(type_p)
        return type_p
Returns an object describing the specified guest OS type.
        
        The requested guest OS type is specified using a string which is a
        mnemonic identifier of the guest operating system, such as
        "win31" or "ubuntu". The guest OS type ID of a
        particular virtual machine can be read or set using the
        :py:func:`IMachine.os_type_id`  attribute.
        
        The :py:func:`IVirtualBox.guest_os_types`  collection contains all
        available guest OS type objects. Each object has an
        :py:func:`IGuestOSType.id_p`  attribute which contains an identifier of
        the guest OS this object describes.
        
        While this function returns an error for unknown guest OS types, they
        can be still used without serious problems (if one accepts the fact
        that there is no default VM config information).

        in id_p of type str
            Guest OS type ID string.

        return type_p of type :class:`IGuestOSType`
            Guest OS type object.

        raises :class:`OleErrorInvalidarg`
            @a id is not a valid Guest OS type.