Equivalent Conditions test determines whether the dictionary contains the keys

yhsong-linux · yhsong-linux · commit 4c3cc1ab7d31 · 2015-09-07T10:03:07.000+08:00
diff --git a/using_dict.py b/using_dict.py
@@ -19,5 +19,7 @@
 for name,address in ab.items():
 	print('Contact %s at %s' % (name, address))
 
-if 'Guido' in ab:
+# "if .. in .." Equivalent to "D.__contains__('key')"
+#if 'Guido' in ab: 
+if ab.__contains__('Guido'):
 	print('\nGuido\'s address is %s' % ab['Guido'])
