numba jit: 'DataFlowAnalysis' object has no attribute 'op_STORE_DEREF'

Question

I'm trying to run the following code with numba but get an error:

from numba import jit

@jit(nopython=True)
def create_card_deck():
    values = "23456789TJQKA"
    suites = "CDHS"
    Deck = []
    [Deck.append(x + y) for x in values for y in suites]
    return Deck

create_card_deck()

Any suggestions what is causing this error are appreciated:

'DataFlowAnalysis' object has no attribute 'op_STORE_DEREF'

Answer 1

There are two problems here - the more fundamental one is that numba doesn't support strings in nopython mode

@jit(nopython=True)
def create_card_deck():
    values = "23456789TJQKA"
    suites = "CDHS"
    return values

In [4]: create_card_deck()
---------------------------------------------------------------------------
NotImplementedError : Failed at nopython (nopython mode backend)
cannot convert native str to Python object

That specific error is because list comprehensions are also not currently supported in nopython mode.

https://github.com/numba/numba/issues/504