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payphone/core/utils.py

@@ -0,0 +1,27 @@
+from typing import Callable, Iterable, TypeVar
+
+
+T = TypeVar("T")
+U = TypeVar("U")
+
+
+def deduplicate(iter: Iterable[T], key: Callable[[T], U] = lambda i: i) -> list[T]:
+    """Deduplicates an Iterable.
+
+    Args:
+        iter (Iterable[T]): The iterable with items to deduplicate.
+        key (Callable[[T], U], optional): The key by which to deduplicate. Defaults to `lambda i: i`.
+
+    Returns:
+        list[T]: A list with the deduplicated items.
+    """
+
+    found_keys = set()
+
+    result = []
+
+    for i in iter:
+        if key(i) not in found_keys:
+            result.append(i)
+    
+    return result