Implement utility functions for list and dict operations

Added functions to remove duplicates, count occurrences, and reverse a dictionary.

Author: kerimcandede

Week03/sequences_kerimcan_dede.py

@@ -0,0 +1,18 @@
+def remove_duplicates(seq: list) -> list:
+    new_list = []
+    for i in seq:
+        if i not in new_list:
+            new_list.append(i)
+    return new_list
+
+def list_counts(seq: list) -> dict:
+    result_dict = dict.fromkeys(seq, 0)
+    for i in seq:
+        result_dict[i] = result_dict[i] + 1
+    return result_dict
+
+def reverse_dict(d: dict) -> dict:
+    new_dict = {}
+    for key, value in d.items():
+        new_dict[value] = key
+    return new_dict