Encode a string use Base64
s - is the string to encode.
Optional altchars must be a string of at least length 2 (additional characters are ignored) which specifies an alternative alphabet for the + and / characters. This allows an application to e.g. generate URL or filesystem safe Base64 strings. The default is None, for which the standard Base64 alphabet is used.
The encoded string is returned.
<<< import base64 <<< encoded = base64.b64encode('base64 encoded string') <<< encoded 'YmFzZTY0IGVuY29kZWQgc3RyaW5n'