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number = 15

if number > 10:
    # Conditional branch not yet implemented
    raise NotImplementedError("Handling for numbers greater than 10 is not yet implemented")
else:
    print("10 or below.")

# Indicating Unimplemented Features with NotImplementedError

`NotImplementedError` is an exception used to indicate that a certain feature has not been implemented yet.

It is primarily used during the development process to mark functionalities that will be implemented later.

```python title="Example Usage of NotImplementedError"
number = 11

if number > 10:
    raise NotImplementedError("Handling for numbers greater than 10 is not yet implemented")
else:
    print("The number is 10 or less.")
```

In the code example above, if the variable `number` exceeds `10`, a `NotImplementedError` is raised.

At this time, the message of the `NotImplementedError` indicates "Handling for numbers greater than 10 is not yet implemented".

Similar to the `pass` keyword previously introduced, it is used to mark functions that will be implemented in the future, but `NotImplementedError` is used to more explicitly convey the necessity of implementation.

When `NotImplementedError` is called, the program immediately halts and outputs an exception message indicating the function is not implemented.

### `NotImplementedError` does nothing when called.

Indicating Unimplemented Features with NotImplementedError

NotImplementedError does nothing when called.

`NotImplementedError` does nothing when called.