class_docstr: This class supports both the minimal and optional command sets.
  Arguments can be strings or integers (where appropriate)
  (e.g.: retr(1) and retr('1') both work equally well.
  
  Minimal Command Set:
          USER name               user(name)
          PASS string             pass_(string)
          STAT                    stat()
          LIST [msg]              list(msg = None)
          RETR msg                retr(msg)
          DELE msg                dele(msg)
          NOOP                    noop()
          RSET                    rset()
          QUIT                    quit()
  
  Optional Commands (some servers support these):
          RPOP name               rpop(name)
          APOP name digest        apop(name, digest)
          TOP msg n               top(msg, n)
          UIDL [msg]              uidl(msg = None)
          CAPA                    capa()
          STLS                    stls()
          UTF8                    utf8()
  
  Raises one exception: 'error_proto'.
  
  Instantiate with:
          POP3(hostname, port=110)
  
  NB:     the POP protocol locks the mailbox from user
          authorization until QUIT, so be sure to get in, suck
          the messages, and quit, each time you access the
          mailbox.
  
          POP is a line-based protocol, which means large mail
          messages consume lots of python cycles reading them
          line-by-line.
  
          If it's available on your mail server, use IMAP4
          instead, it doesn't suffer from the two problems
          above.
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docstr: Unmark all messages marked for deletion.
docstr_tok: ["Unmark","all","messages","marked","for","deletion","."]
code: def rset(self):
      """Unmark all messages marked for deletion."""
      return self._shortcmd("RSET")
  
imports: import errno
  import re
  import socket
  import sys
label_desc: Use image node_id 19 for calling the POP3 obj's underlying member method code with example usage: obj.rset() and returns: self