ch04

ch04/key.points.mutable.py

@@ -0,0 +1,7 @@
+# key.points.mutable.py
+x = [1, 2, 3]
+def func(x):
+    x[1] = 42  # this affects the `x` argument!
+
+func(x)
+print(x)  # prints: [1, 42, 3]