feat: 新增技能扩展N11一章相关示例源码

code/newsletter/N11/tests/test_accumulate.py

@@ -0,0 +1,27 @@
+from typing import Tuple, TypeVar
+
+import pytest
+
+Number = TypeVar("Number", int, float)
+
+
+def accumulate(*numbers: Tuple[Number]) -> Number:
+    result = 0
+    for n in numbers:
+        if not isinstance(n, (int, float)):
+            raise ValueError(f"{n} isn't a valid number value")
+
+        result += n
+
+    return result
+
+
+def test_accumulate():
+    numbers = [1, 2, 3, 4]
+    expected = 10
+
+    assert accumulate(*numbers) == expected
+
+
+if __name__== '__main__':
+    pytest.main()