9.10 Explicitly Raising an Exception¶

Sometimes you might need to write functions that raise exceptions to inform callers of errors that occur
raise statement explicitly raises an exception
```
raise ExceptionClassName
```
Creates an object of the specified exception class
Exception class name may be followed by parentheses containing arguments to initialize the exception object—typically a custom error message string
Code that raises an exception first should release any resources acquired before the exception occurred
It’s recommended that you use one of Python’s many built-in exception types

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