Add functions for removing duplicates and counting items

Author: helinHarman

Week03/sequences_Helin_Harman.py

@@ -0,0 +1,11 @@
+def remove_duplicates(seq: list) -> list:
+    return list(set(seq))
+
+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 {value: key for key, value in d.items()}