base64.py

import base64

# Create a string and encode to bytes
s  = 'Convert me to base64!'
sb = s.encode('utf-8')

# Take bytes and encode to base64 string
sb64 = base64.b64encode(sb).decode()
# Q29udmVydCBtZSB0byBiYXNlNjQh

# Take base64 string and decode back to original string
base64.b64decode(sb64).decode('utf-8')
# 'Convert me to base64!'