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I'm writing a Python module in C. I need to report errors that can't be described by built-in Python exceptions. I therefore wish to throw exceptions of my own type. The problem is, that Python policy is to derive all exceptions from BaseException class. I know how to create a derived type object (assigning to tp_base memeber), but I don't know how to obtain a reference to BaseException type object. PyExc_BaseException is a reference to PyObject, representing a class, not a type object.
How do I throw custom Python exceptions from C code?
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Creating Custom Exceptions In Python, users can define custom exceptions by creating a new class. This exception class has to be derived, either directly or indirectly, from the built-in Exception class. Most of the built-in exceptions are also derived from this class.
Overview. The typing_extensions module serves two related purposes: Enable use of new type system features on older Python versions. For example, typing. TypeGuard is new in Python 3.10, but typing_extensions allows users on Python 3.6 through 3.9 to use it too.
In simple words, we can say that a User-Defined Exception or custom exception is creating your own exception class and throwing that exception using the 'throw' keyword. For example, MyException in the below code extends the Exception class.
The easiest way to create a new exception type in C code is to call PyErr_NewException.
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