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[solved] C API version of str(exception) is not the same as pure python version


On Sunday, 10 February 2019 11:59:16 GMT Barry Scott wrote:
> When I use the C API to get the str() of an execption I see this text:
> 
> 	<class 'TypeError'>
> 
> But python reports the following for the same exception:
> 
> 	TypeError: unsupported operand type(s) for +: 'int' and 'str'
> 
> What do I need to do in the C API to get the the same text for the
> exception?
> 

>     PyObject *err = PyErr_Occurred();
>     if( err != 0 )
>     {
>         PyObject *u_why = PyObject_Str( err );
>         PyObject *b_why = PyUnicode_AsEncodedString( u_why, "utf-8",
> "strict" );
>         int size = PyBytes_Size( b_why );
>         char *why = PyBytes_AsString( b_why );
>         printf("Error: %*s\n", size, why );
>         return 0;
>     }

Using this code fixes the problem as Stefan pointed out I had the type of the 
exception and not the value of the exception.

    if( PyErr_Occurred() )
    {
        PyObject *type, *value, *trace;
        PyErr_Fetch( &type, &value, &trace );

        PyObject *u_why = PyObject_Str( value );
        PyObject *b_why = PyUnicode_AsEncodedString( u_why, "utf-8", "strict" 
);
        int size = PyBytes_Size( b_why );
        char *why = PyBytes_AsString( b_why );
        printf("Error: %*s\n", size, why );
        return 0;
    }