'Create a text/* type MIME document.
_text is the string for this message object.
_subtype is the MIME sub content type, defaulting to "plain".
_charset is the character set parameter added to the Content-Type
header.  This defaults to "us-ascii".  Note that as a side-effect, the
Content-Transfer-Encoding header will also be set.'

def __init__(self, _text, _subtype='plain', _charset='us-ascii'):

    MIMENonMultipart.__init__(self, 'text', _subtype, **{'charset': _charset})
    self.set_payload(_text, _charset)
