Encode and decode Base64 without "=" padding.
RFC 4648 specifies that Base64 should be padded to a multiple of 4 bytes using "=" characters. However many protocols choose to omit the "=" padding.
python3 -m pip install unpaddedbase64
import unpaddedbase64
assert (unpaddedbase64.encode_base64(b'\x00')) == 'AA'
assert (unpaddedbase64.decode_base64('AA')) == b'\x00'