142 def _encode_text(string, charset, cte, policy):  argument
147     if cte==None:
162             cte = 'base64'
164             cte = 'quoted-printable'
166                 return cte, sniff_qp
167     if cte == '7bit':
169     elif cte == '8bit':
171     elif cte == 'quoted-printable':
174     elif cte == 'base64':
177         raise ValueError("Unknown content transfer encoding {}".format(cte))
178     return cte, data
181 def set_text_content(msg, string, subtype="plain", charset='utf-8', cte=None,  argument
185     cte, payload = _encode_text(string, charset, cte, msg.policy)
190     msg['Content-Transfer-Encoding'] = cte
195 def set_message_content(msg, message, subtype="rfc822", cte=None,  argument
201         if cte not in (None, '7bit', '8bit', 'binary'):
204                 "message/rfc822 parts do not support cte={}".format(cte))
210         cte = '8bit' if cte is None else cte
212         if cte not in (None, '7bit'):
215                 "message/external-body parts do not support cte={}".format(cte))
216         cte = '7bit'
217     elif cte is None:
220         cte = '7bit'
223     msg['Content-Transfer-Encoding'] = cte
228 def set_bytes_content(msg, data, maintype, subtype, cte='base64',  argument
232     if cte == 'base64':
234     elif cte == 'quoted-printable':
240     elif cte == '7bit':
244     elif cte in ('8bit', 'binary'):
247     msg['Content-Transfer-Encoding'] = cte