Implement utility functions for list and dict operations

Week03/sequences_efesamil_sarigul.py

@@ -0,0 +1,21 @@
+def remove_duplicates(sequence: list) -> list:
+    new_list = []
+    for item in sequence:
+        if item not in new_list:
+            new_list.append(item)
+    return new_list
+
+def list_counts(sequence: list) -> dict:
+    counts = {}
+    for item in sequence:
+        if item in counts:
+            counts[item] += 1
+        else:
+            counts[item] = 1
+    return counts
+
+def reverse_dict(d: dict) -> dict:
+    new_d = {}
+    for k, v in d.items():
+        new_d[v] = k 
+    return new_d