Re: [Quantlib-users] ZeroInflationIndex cannot be constructed from Python

[Kenji O. <for...@gm...>]

Hi Luigi,

Thank you very much for the clarification.

I was not aware of ql.CustomRegion, but after creating a CustomRegion for
Japan and passing it to the ZeroInflationIndex constructor, everything
worked as expected.

I really appreciate your help.

By the way, I am based in Japan and have published a book here related to
QuantLib-Python.
Its ISBN-13 is *978-4320096530*.

Thank you again for your support.

Best regards,
Kenji Ogawa

2026年1月5日(月) 17:36 Luigi Ballabio <lui...@gm...>:

> Hi,
>     ql.Japan() is a calendar, not an instance of Region.  You can create a
> region for Japan using the ql.CustomRegion class.  Once you pass that to
> the ZeroInflationIndex constructor, it should work.
>
> Hope this helps,
>     Luigi
>
>
> On Sun, Jan 4, 2026 at 1:33 AM Kenji Ogawa <for...@gm...> wrote:
>
>> Hi there,
>>
>> I am unable to construct a ZeroInflationIndex from Python using QuantLib
>> version 1.40 and the current constructor.
>>
>> The following Python code fails on my side:
>>
>> import QuantLib as ql
>> jpCPI = ql.ZeroInflationIndex(
>>     "Japan CPI",
>>     ql.Japan(),
>>     False,
>>     ql.Monthly,
>>     ql.Period(3, ql.Months),
>>     ql.JPYCurrency()
>> )
>>
>> Could you please point me to the specific place where this should be
>> fixed?
>>
>> Regards, Kenji
>> _______________________________________________
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>>
>