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16 lines
451 B
Markdown
16 lines
451 B
Markdown
---
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title: "NotImplemented"
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date: 2019-10-27T23:35:17-04:00
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draft: false
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---
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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.
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```python
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class A:
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def __mul__(self, x):
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if not isinstance(x, A):
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return NotImplemented
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return someOperation()
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```
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