Adding source code files for Chapter 6

Chapter6/dictionary/dictionary1.py

@@ -0,0 +1,8 @@
+# dictionary1.py
+
+dict1 = {100:{'name':'John', 'age':24},
+         101:{'name':'Mike', 'age':22},
+         102:{'name':'Jim', 'age':21} }
+
+print(dict1)
+print(dict1.get(100))

Chapter6/dictionary/dictionary2.py

@@ -0,0 +1,21 @@
+# dictionary2.py
+#defining inner dictionary 1
+student100 = {'name': 'John', 'age': 24}
+
+#defining inner dictionary 2
+student101 = {}
+student101['name'] = 'Mike'
+student101['age'] = '22'
+
+#assiging inner dictionaries 1 and 2 to a root dictionary
+dict1 = {}
+dict1[100] = student100
+dict1[101] = student101
+
+#creating inner dictionary directly inside a root dictionary
+dict1[102] = {}
+dict1[102]['name'] = 'Jim'
+dict1[102]['age'] = '21'
+
+print(dict1)
+print(dict1.get(102))

Chapter6/dictionary/dictionary3.py

@@ -0,0 +1,10 @@
+# dictionary3.py
+
+dict1 = {100:{'name':'John', 'age':24},
+         101:{'name':'Mike', 'age':22},
+         102:{'name':'Jim', 'age':21} }
+
+print(dict1.get(100))
+print(dict1.get(100).get('name'))
+print(dict1[101])
+print(dict1[101]['age'])

Chapter6/dictionary/dictionary4.py

@@ -0,0 +1,10 @@
+# dictionary4.py
+
+dict1 = {100:{'name':'John', 'age':24},
+         101:{'name':'Mike', 'age':22},
+         102:{'name':'Jim', 'age':21} }
+
+del (dict1[101]['age'])
+print(dict1)
+dict1[102].pop('age')
+print(dict1)