Add dictionary sample code

Author: hermite2053

data_structures/dictionary/dict.py

@@ -0,0 +1,15 @@
+greek = {'alpha': 1, 'beta': 2, 'gamma': 3}
+
+greek['delta'] = 4 # add a key and coressponding value
+print(greek)
+
+del greek['beta'] # delete item
+print(greek)
+
+print(list(greek)) # return list of the dicitonary
+print(sorted(greek)) # return a new sorted instance of the iterable
+print(len(greek)) # return the number of items in the dictionary
+print(greek.get('delta')) # return the value coressponding given key
+
+print('alpha' in greek) # testing
+print('zeta' in greek) # testing

data_structures/dictionary/loop_with_doct.py

@@ -0,0 +1,3 @@
+numbers = {'one': 1, 'two': 2, 'three': 3, 'four': 4}
+for k, v in numbers.items():
+    print(f'{k} -- {v}')