Re: [Quantlib-users] Error in writing Python tests for FXForward

[Luigi B. <lui...@gm...>]

Hello Chirag,
    please don't use the latest 1.41.  Backporting your class manually
might skip some steps.  Use a checkout from the latest master from GitHub,
where your FxForward is already included correctly.  Use a checkout for the
SWIG part too; you'll have to do that anyway in order to open a pull
request.

Luigi


On Mon, Mar 16, 2026 at 8:53 AM Chirag Desai <chi...@ya...>
wrote:

> Hi Luigi
>
> I am very sorry but may not have been clear enough
>
> 1) I got the latest versions of Quantlib 1.41 and Quantlib-SWIG 1.41
> 2) I manually added the FXForward class in my local version and it builds
> fine and the test for it under testsuite works fine
> 3) I added the fxforward.i and amended ql.i
> 4) When I build the python wheel it cannot find the FX Forward class
>
> (When I do the above exercise without the FX Forward class, I can build
> the wheel successfully and all works well)
>
> [image: Inline image]
>
> On Sunday, March 15, 2026 at 12:33:03 AM GMT+8, Luigi Ballabio <
> lui...@gm...> wrote:
>
>
> Your new class is not in QuantLib 1.41.  You need to check out the latest
> versions of QuantLib and QuantLib-SWIG from GitHub and use those ones.
>
> Luigi
>
>
> On Sat, Mar 14, 2026 at 5:41 AM Chirag Desai <chi...@ya...>
> wrote:
>
> Thank you Mr Luigi
>
> 1) I added in ql.i and recompiled Quantlib as well
>
> 2) I get error messages now when building the wheel stating FXForward
> class cannot be found. I have attached the error messages.
>
> Build was successful
> [image: Inline image]
>
> [image: Inline image]
>
>
>
> On Friday, March 13, 2026 at 10:50:47 PM GMT+8, Luigi Ballabio <
> lui...@gm...> wrote:
>
>
> Hi Chirag, did you add your fxforward.i to the files included in ql.i ?
>
> Luigi
>
>
> On Fri, Mar 13, 2026 at 7:42 AM Chirag Desai <chi...@ya...>
> wrote:
>
> Hi All
> I built Quantlib with the new fxforward.hpp, fxforward.cpp ,
> fxforwarddiscountingengine hpp.cpp which I had recently contributed and
> successfully in my own version of Quantlib 1.41. All tests work
>
> I placed my fxforward.i file and swig runs successfully
>
> The wheel is generated successfully
>
> I am able to pip install the wheel and successfully can “import Quantlib
> as ql” and also can run certain Python files under SWIG in Examples and
> Tests (european-option.py, test_blackformula.py)
>
> For some reason my FX Forward tests all fail. (attached test_fxforward.py)
>
> How do I check if my FXForward class was successfully exposed to the
> Python API ? If any tools available ?
>
> When I do ql.  there is no dropdown either in IDE like VSCode to see what
> ql functions are being exposed in Python ?
> Thank you all
>
>
>
>
>
>