IBKR adapter imports unsupported UNSET_DECIMAL from ibapi

[jankleinsorge]

Toying with package versions

nautilus-ibapi 10.19.4
nautilus_trader 1.210.0
ibapi 9.81.1.post1

and example

https://github.com/nautechsystems/nautilus_trader/blob/develop/examples/live/interactive_brokers/connect_with_tws.py

for a direct TWS-connection (so non-containerized) yields an import error regarding UNSET_DECIMAL

Traceback (most recent call last):
  File "<...>", line 19, in <module>
      from nautilus_trader.adapters.interactive_brokers.config import IBMarketDataTypeEnum
        File "<...>/lib/python3.11/site-packages/nautilus_trader/adapters/interactive_brokers/config.py", line 23, in <module>
            from nautilus_trader.adapters.interactive_brokers.common import IBContract
              File "<...>/lib/python3.11/site-packages/nautilus_trader/adapters/interactive_brokers/common.py", line 19, in <module>
                  from ibapi.common import UNSET_DECIMAL
                  ImportError: cannot import name 'UNSET_DECIMAL' from 'ibapi.common' (<...>/lib/python3.11/site-packages/ibapi/common.py)

where UNSET_DECIMAL is indeed not present (anymore or yet?) in said ibapi version.

Expected Behavior

No import error

Actual Behavior

Import error as described above

Steps to Reproduce the Problem

1. Try given example from example/ directory under given package versions (current stable versions as of today)

Specifications

• WSL2/debian 12.8
• Python 3.11.2
• nautilus_trader 1.210.0

[jankleinsorge]

Original constant seems to have been 'UNSET_DECIMAL = 1e10'.
It seems incompatilbity goes deeper. Follow up issue is:
ImportError: cannot import name 'ListOfHistoricalSessions' from 'ibapi.common'
I will stop here in order not to spam the ticket.

[cjdsellers]

Hi @jankleinsorge

Thanks for the report.

Could it be because you have both the ibapi and nautilus-ibapi packages installed?

Because it looks like that constant is indeed there https://github.com/nautechsystems/nautilus_ibapi/blob/d1133f23e3a10f819c9ad0585ece5b9dc7bf263a/ibapi/common.py#L21

Preemptively closing for now, but we can keep discussing here if you believe there is still an issue.

[jankleinsorge]

@cjdsellers correct assessment. 'ibapi' gets precedence in this setup and seems to have diverted. Thank you.