'Set escape character; ``none\'\' = disable'

def opt_escape(self, esc):

    if (esc == 'none'):
        self['escape'] = None
    elif ((esc[0] == '^') and (len(esc) == 2)):
        self['escape'] = chr((ord(esc[1]) - 64))
    elif (len(esc) == 1):
        self['escape'] = esc
    else:
        sys.exit(("Bad    escape    character    '%s'." % esc))
