练习内建模块之base64

Author: SergioJune

test40.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+'练习内建模块之base64'
+
+__author__ = 'sergiojune'
+import base64
+
+# 进行base64编码，转为字符串
+b = b'binary\x00strg='
+bs = base64.b64encode(b)
+print(bs)
+# 解码
+b = base64.b64decode(bs)
+print(b)
+
+
+# 对于网页的安全编码
+s = b'i\xb7\x1d\xfb\xef\xff'
+bs = base64.b64encode(s)
+print(bs)
+bs = base64.urlsafe_b64encode(s)
+print(bs)
+
+
+# 作业：请写一个能处理去掉=的base64解码函数
+def safe_base64_decode(s):
+    while len(s) % 4 !=0:
+        s += b'='
+    bs = base64.b64decode(s)
+    return bs
+
+
+# 测试:
+assert b'abcd' == safe_base64_decode(b'YWJjZA=='), safe_base64_decode('YWJjZA==')
+assert b'abcd' == safe_base64_decode(b'YWJjZA'), safe_base64_decode('YWJjZA')
+print('ok')