Python Built-In Implementation of Base64

Data Encoding Tutorials - Herong's Tutorial Examples

∟Python Built-In Implementation of Base64

This section provides a test program for the default Python implementation of the Base64 encoding algorithm base64.b64encode() and base64.b64decode() methods.

The Base64 encoding algorithm bas been implemented in Python 3 language as 2 built-in methods:

base64.b64encode() - Encodes data with the Base64 algorithm from bytes to bytes.
base64.b64decode() - Decodes data with the Base64 algorithm from bytes to bytes.

To test these built-in functions, I wrote this simple testing program:

# Base64_Encode_Test.py
# Copyright (c) 2010 HerongYang.com. All Rights Reserved.
#
import base64

def test(theInput, theExpected):
  inputBytes = theInput.encode();
  encodedBytes = base64.b64encode(inputBytes)
  decodedBytes = base64.b64decode(encodedBytes)
  print("   Input   : "+theInput)
  print("   Encoded : "+encodedBytes.decode())
  print("   Expected: "+theExpected)
  print("   Decoded : "+decodedBytes.decode())

print("Test 1:")
theInput = "A"
theExpected = "QQ=="
test(theInput, theExpected)

print("Test 2:")
theInput = "AB"
theExpected = "QUI="
test(theInput, theExpected)

print("Test 3:")
theInput = "ABC"
theExpected = "QUJD"
test(theInput, theExpected)
   
print("Test 4:")
theInput = "The quick brown fox jumps over the lazy dog."
theExpected = \
  "VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4="
test(theInput, theExpected)

Here is the test result:

herong> python3 Base64_Encode_Test.py

Test 1:
   Input   : A
   Encoded : QQ==
   Expected: QQ==
   Decoded : A
Test 2:
   Input   : AB
   Encoded : QUI=
   Expected: QUI=
   Decoded : AB
Test 3:
   Input   : ABC
   Encoded : QUJD
   Expected: QUJD
   Decoded : ABC
Test 2:
   Input   : The quick brown fox jumps over the lazy dog.
   Encoded : VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4=
   Expected: VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4=
   Decoded : The quick brown fox jumps over the lazy dog.