String as an argument to the node in pipeline.

I want to add feature engineering in the pipeline for every feature and for that I want to pass a string as an argument to the function inside the node but that’s not allowed in kedro yet and I get following error:- ValueError: Pipeline input(s) {"xxxx","yyyy"} not found in the DataCatalog So I want to know if there’s a way to use string as in argument inside node.

Thanks in advance.

[WaylonWalker]

Currently kedro only supports passing parameters or catalog entries to nodes. The way that you would pass other options in would be with a partial or a lambda. I most often use lambdas, you can look up how to do it with functools.partial if you would rather use that.

def my_func(data, param):
   data[feature] = param
   return data

node(
   func= lambda data: my_func(data, 'xxx')
   ...
)

node(
   func= lambda data: my_func(data, 'yyy')
   ...
)

I often generate nodes dynamically, be careful to bind your inputs to your lambdas if you create them in a loop. More on that in this article https://waylonwalker.com/blog/bind-dynamic-lambdas.

[sansagara]

Thats a nice suggestion, i must say.