Python Node 1=>1 Input/Output

KNIME Analytics Platform
1

Hi there fellas,

I am struggling with the use of Python Nodes: the in- and output to be precise.

So far I have embedded it correctly and I can run python code in it. However, the in-and output in this case are files, which are read via hard code with a path, because I can’t figure out the input and output table in the python node.

My goal is to process data consisting of 3 columns and feed them into the Python Node, do some processing and generate one extra column, then have all 4 columns as output so that I can process the data in different nodes.

Tipps and tricks will be much appreciated!

Cheers

2

It would help if you provided your workflow and sample data so that we can see what you’re working with and how the nodes are configured.

1 Like
3

Understandable, but I really am interested into understanding the intput_table and output_table. Here is a basic workflow, where I have 3 columns mapped to the input_table and now I am not sure on how to print out a newly created column and the 3 from the start.

Thank you for your time.

BasicPythonAction.knwf (7.3 KB)

4

@nooby you can just use the input_table and output_table with the standard nodes. This will be Pandas data frames you will have to create within your Python environment.

But you are free to Im- and Export other data like Parquet, Pickle or NPZ or PNG directly within from within your code.

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5

If you replace the last line of your code with:
output_table = df
then you’ll get the output you desire.

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6

Thanks for the help, you two. Much appreciated.

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