Implement utility functions for list and dict operations

Added functions to remove duplicates from a list, count occurrences of items in a list, and reverse a dictionary.

Author: EsraSepik

Week03/sequences_esra_sepik.py

@@ -0,0 +1,22 @@
+def remove_duplicates(seq: list) -> list:
+    """
+    This function removes duplicates from a list.
+    """
+    return list(dict.fromkeys(seq))
+
+
+def list_counts(seq: list) -> dict:
+    """
+    This function counts the number of occurrences of each item in a list.
+    """
+    return {item: seq.count(item) for item in seq}
+
+
+def reverse_dict(d: dict) -> dict:
+    """
+    This function reverses the keys and values of a dictionary.
+    """
+    reversed_d = {}
+    for key, value in d.items():
+        reversed_d[value] = key
+    return reversed_d