code: def encode_base64(msg):
      """Encode the message's payload in Base64.
  
      Also, add an appropriate Content-Transfer-Encoding header.
      """
      orig = msg.get_payload()
      encdata = _bencode(orig)
      msg.set_payload(encdata)
      msg["Content-Transfer-Encoding"] = "base64"
  
file_path: catboost/contrib/tools/python/src/Lib/email/encoders.py
imports: import base64
  from quopri import encodestring
label_desc: Use image node_id 3 for calling a global function with example usage: encode_base64(msg) without return types