Create sequences_Sevval_Ok.py

Week03/sequences_Sevval_Ok.py

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+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:
+    counts = {}
+    for item in seq:
+        counts[item] = counts.get(item, 0) + 1
+    return counts
+
+
+def reverse_dict(d: dict) -> dict:
+    reversed_d = {}
+
+    for key, value in d.items():
+        if value not in reversed_d:
+            reversed_d[value] = key
+        else:
+            if isinstance(reversed_d[value], list):
+                reversed_d[value].append(key)
+            else:
+                reversed_d[value] = [reversed_d[value], key]
+
+    return reversed_d
+
+if __name__ == "__main__":
+    print(remove_duplicates([1, 2, 1, 3, 2, 4, 4]))
+    print(list_counts(["a", "b", "a", "c", "b", "a"]))
+    print(reverse_dict({"x": 1, "y": 2}))
+    print(reverse_dict({"x": 1, "y": 1, "z": 2}))