Add examples of handy Python tricks

python_tricks.py

@@ -0,0 +1,34 @@
+# A few handy Python tricks
+
+
+def swap_variables():
+    """Swap two variables without a temporary variable."""
+    a, b = 1, 2
+    a, b = b, a
+    return a, b
+
+
+def unpack_iterable():
+    """Unpack first, middle and last elements of a list."""
+    numbers = [1, 2, 3, 4]
+    first, *middle, last = numbers
+    return first, middle, last
+
+
+def merge_dictionaries():
+    """Merge two dictionaries using the | operator."""
+    a = {"x": 1}
+    b = {"y": 2}
+    return a | b
+
+
+def list_comprehension():
+    """Return squares of even numbers using list comprehension."""
+    return [i * i for i in range(10) if i % 2 == 0]
+
+
+if __name__ == "__main__":
+    print("swap_variables:", swap_variables())
+    print("unpack_iterable:", unpack_iterable())
+    print("merge_dictionaries:", merge_dictionaries())
+    print("list_comprehension:", list_comprehension())