Add functions for removing duplicates and counting items

Author: hakan0363

Week03/Week03/sequences_ahmet_hakan_yildirim.py

@@ -0,0 +1,23 @@
+def remove_duplicates(seq: list) -> list:
+    seen = set()
+    result = []
+    for item in seq:
+        if item not in seen:
+            seen.add(item)
+            result.append(item)
+    return result
+
+def list_counts(seq: list) -> dict:
+    result = {}
+    for item in seq:
+        if item in result:
+            result[item] += 1
+        else:
+            result[item] = 1
+    return result
+
+def reverse_dict(d: dict) -> dict:
+    reversed_d = {}
+    for key, value in d.items():
+        reversed_d[value] = key
+    return reversed_d