add doctest sample

Author: michaelliao

samples/debug/mydict2.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+class Dict(dict):
+    '''
+    Simple dict but also support access as x.y style.
+
+    >>> d1 = Dict()
+    >>> d1['x'] = 100
+    >>> d1.x
+    100
+    >>> d1.y = 200
+    >>> d1['y']
+    200
+    >>> d2 = Dict(a=1, b=2, c='3')
+    >>> d2.c
+    '3'
+    >>> d2['empty']
+    Traceback (most recent call last):
+        ...
+    KeyError: 'empty'
+    >>> d2.empty
+    Traceback (most recent call last):
+        ...
+    AttributeError: 'Dict' object has no attribute 'empty'
+    '''
+    def __init__(self, **kw):
+        super(Dict, self).__init__(**kw)
+
+    def __getattr__(self, key):
+        try:
+            return self[key]
+        except KeyError:
+            raise AttributeError(r"'Dict' object has no attribute '%s'" % key)
+
+    def __setattr__(self, key, value):
+        self[key] = value
+
+if __name__=='__main__':
+    import doctest
+    doctest.testmod()
+