The code in the snippet below comes from the documentation

Question

The code in the snippet below comes from the documentation <https docs dagster io concepts types defining a dagster type> However it does not work and returns the error below Is this a problem on my end or in the documentation ```Traceback most recent call last File Users thomas miniforge3 envs datagenerator lib python3 10 site packages IPython core interactiveshell py line 3433 in run code exec code obj self user global ns self user ns File lt ipython input 22 26c8dc208c5a gt line 10 in lt module gt ins= num In EvenDagsterType TypeError list object is not callable```

jamie · Answer

hi < Thomas> I will check this in a minute hopping in a meeting right now but could you try removing the comma from the end of the lambda function so it would be ` ```lambda value isinstance value int and value 2 == 0```

Thomas · Answer

Hi < jamie> thanks unfortunately it did not change the error code Did you find anything else Thanks

jamie · Answer

not yet i have a bit of time right now so i m going to try to replicate this

jamie · Answer

hmmm it works for me here s what i m doing ```from dagster import op DagsterType In Out job repository EvenDagsterType = DagsterType name= EvenDagsterType type check fn=lambda value isinstance value int and value 2 == 0 op def two return 2 op ins= num In EvenDagsterType out=Out EvenDagsterType def double even num return num job def my job double even two repository def my repo return my job ``` and then loading up dagit and running the job from there I m also running latest version of dagster

Thomas · Answer

Thank you for the help