Numba jitclass TypeError with full traceback

[Duarte Stokes]

Hi there,

I am using Numba v0.54.0 and I would like to know how to get the full traceback when dealing with the following error (which occurs at runtime):

-------------------------------------

import numba as nb

optional_bool = nb.optional(nb.boolean)

spec = [('my_bool', optional_bool)]

@nb.experimental.jitclass(spec)

class Foo():

    def __init__(self) -> None:

        self.my_bool = None

    def my_method(self) -> None:

        print('Inside `my_method`')

        if self.my_bool:

            print('Inside `if` statement')

Foo_type = Foo.class_type.instance_type

wrapper_signature = Foo_type()

@nb.jit(wrapper_signature, nopython=True)

def wrapper():

    foo = Foo()

    foo.my_method()

    return foo

if __name__ == '__main__':

    wrapper()

-----------------------------------------

I get the following output:

Inside `my_method`

Traceback (most recent call last):

  File "test.py", line 29, in <module>

    wrapper()

TypeError: expected bool, got None

However, if at the last line of code I write instead wrapper.py_func(), the traceback goes a little bit further (into the jitclass method):

Traceback (most recent call last):

  File "test.py", line 29, in <module>

    wrapper.py_func()

  File "test.py", line 25, in wrapper

    foo.my_method()

  File "C:\Users\statt\anaconda3\lib\site-packages\numba\experimental\jitclass\boxing.py", line 60, in wrapper

    return method(*args, **kwargs)

TypeError: expected bool, got None

Still, I need much more feedback to pinpoint the problem, which in this example occurs at:

if self.my_bool: # Turns out self.my_bool is None

Could someone give me a hand?

Thanks in advance!