b64encode

Encode the bytes-like object s using Base64 and return a bytes object.

Optional altchars should be a byte string of length 2 which specifies an
alternative alphabet for the '+' and '/' characters.  This allows an
application to e.g. generate url or filesystem safe Base64 strings.

If padded is false, omit padding in the output.

If wrapcol is non-zero, insert a newline (b'\n') character after at most
every wrapcol characters.