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content/blog/notimplemented.md

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+---
+title: "NotImplemented"
+date: 2019-10-27T23:35:17-04:00
+draft: false
+---
+
+Let's say you overwrite the `__mul__` operator in a class in Python, but you don't want the function to be called for all kinds of input. You can specify the type by just returning `NotImplemented` for types you don't want.
+
+```python
+class A:
+    def __mul__(self, x):
+        if not isinstance(x, A):
+            return NotImplemented
+        return someOperation()
+```
+