Add utility functions for list and dict operations

Week03/sequences_almira_keles.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from typing import Any
+
+
+def remove_duplicates(seq: list) -> list:
+
+    seen = set()
+    out = []
+    for item in seq:
+        if item not in seen:
+            seen.add(item)
+            out.append(item)
+    return out
+
+
+def list_counts(seq: list) -> dict:
+
+    counts = {}
+    for item in seq:
+        counts[item] = counts.get(item, 0) + 1
+    return counts
+
+
+def reverse_dict(d: dict) -> dict:
+
+    return {v: k for k, v in d.items()}