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12.5.2 Folder Objects

`Folder` instances represent open folders and have the following methods:

`error`( | format[, ...])

  Print an error message - can be overridden.

`getfullname`( | )

  Return the folder's full pathname.

`getsequencesfilename`( | )

  Return the full pathname of the folder's sequences file.

`getmessagefilename`( | n)

  Return the full pathname of message n of the folder.

`listmessages`( | )

  Return a list of messages in the folder (as numbers).

`getcurrent`( | )

  Return the current message number.

`setcurrent`( | n)

  Set the current message number to n.

`parsesequence`( | seq)

  Parse msgs syntax into list of messages.

`getlast`( | )

  Get last message, or `0` if no messages are in the folder.

`setlast`( | n)

  Set last message (internal use only).

`getsequences`( | )

  Return dictionary of sequences in folder. The sequence names are used as keys, and the values are the lists of message numbers in the sequences.

`putsequences`( | dict)

  Return dictionary of sequences in folder name: list.

`removemessages`( | list)

  Remove messages in list from folder.

`refilemessages`( | list, tofolder)

  Move messages in list to other folder.

`movemessage`( | n, tofolder, ton)

  Move one message to a given destination in another folder.

`copymessage`( | n, tofolder, ton)

  Copy one message to a given destination in another folder.