'prompt MAIN ?CONTINUE?: Changes the prompts for first line and continuation lines
The default is to print \'sqlite> \' for the main prompt where
you can enter a dot command or a SQL statement.  If the SQL
statement is complete (eg not ; terminated) then you are
prompted for more using the continuation prompt which defaults
to \' ..> \'.  Example:
.prompt "Yes, Master> " "More, Master> "
You can use backslash escapes such as \n and \t.'

def command_prompt(self, cmd):

    if ((len(cmd) < 1) or (len(cmd) > 2)):
        raise self.Error('prompt    takes    one    or    two    arguments')
    self.prompt = self.fixup_backslashes(cmd[0])
    if (len(cmd) == 2):
        self.moreprompt = self.fixup_backslashes(cmd[1])
