Update debug_exam.py

debug_exam.py

@@ -32,6 +32,67 @@
 a list [key, value] of length 2.
 '''
 
+#5a)
+if k in data1:
+            v1 = data1[k]
+        if v1 != v2:
+            dupKeys[k] = [v1, v2]
+            del data1[k]
+        else:
+            data1[k] = v2
+    return dupKeys
+
+  #  5b)
+    def uniqueUpdate(data1, data2):
+    # Initially empty dictionary
+    dupKeys = {}
+
+    # Examine every (k, v2) pair in data2
+    for [k, v2] in data2:
+        # Check if there is a key-value
+        # pair with key = k in data1
+        if k in data1:
+            v1 = data1[k]
+            # (k, v1) in dict1
+            # Check if v1 != v2
+            if v1 != v2:
+                # Add (k, [v1, v2])
+                # to dictionary                
+                dupKeys[k] = [v1, v2]
+                # Remove (k, v1) from data1
+                del data1[k]
+        else:
+            # Add (k, v2) to data1
+            data1[k] = v2
+    # After processing all (k, v2) in
+    # data2, return the dictionary
+    return dupKeys
+
+    #5c)
+       test case1:
+       4
+       1 2
+       3 3 
+       3 8
+       4 9
+
+       2
+       3 3 
+       4 4
+       test case 2:
+       4
+       1 2 
+       2 2 
+       3 3
+       4 19
+
+       2 
+       3 3
+       4 19
+
+      # test case 3:
+     #  the test case written in 5a,which breaks the initially wriitten code can be written.
+
 def uniqueUpdate(data1, data2):
     # Initially empty dictionary
     dupKeys = {}