topic Re: How do I pass kwargs to wheel method? in Data Engineering

How do I pass kwargs to wheel method?

ACK — Wed, 27 Jul 2022 08:12:36 GMT

Hi,

I have a method named main it takes **kwargs as a parameter.

def main(**kwargs):
    parameterOne = kwargs["param-one"]
    parameterTwo = kwargs["param-two"]
    parameterThree = kwargs["param-optional-one"] if "param-optional-one" in kwargs else None
    parameterFour = kwargs["param-optional-two"] if "param-optional-two" in kwargs else None

I have declared it as an entry_point in setup

entry_points={
        'console_scripts': [
            'main=ETL.V1:main'
        ]
    },

I am passing keyword arguments in task

"entry_point": "main",
                    "named_parameters": {
                        "param-one": "test",
                        "param-two": "test two"
                    }

when I run the job it goes into main method, but fails on the very first line

KeyError: 'param-one'
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<command--1> in <module>
     16 if entry:
     17   # Load and execute the entrypoint, assumes no parameters
---> 18   entry[0].load()()
     19 else:
     20   import ETL.V1
 
/databricks/python/lib/python3.8/site-packages/ETL/V1.py in main(**kwargs)
      8     for i, v in kwargs.items():
      9         print("    ", i, ": ", v)
---> 10     parameterOne = kwargs['param-one']
     11     parameterTwo = kwargs['param-two']
 
KeyError: 'param-one'

The keyword arguments are not being passed or I am doing something wrong?

I tried to see if anything is in kwargs, however that didn't print anything in the task output just the error above was displayed. So, I can't really tell if anything is in kwargs or not.

Re: How do I pass kwargs to wheel method?

Hubert-Dudek — Wed, 27 Jul 2022 10:41:17 GMT

it is command-line parameters so it is like

---param-one=test

you can test it with ArgumentParser

from argparse import ArgumentParser
 
parser = ArgumentParser()
parser.add_argument("--param-one", dest="parameterOne")
 
args = parser.parse_args()

Re: How do I pass kwargs to wheel method?

ACK — Wed, 27 Jul 2022 12:54:16 GMT

Hi,

Thanks for you answer.

Yes, what you say is correct, we must use argparse to get the keyword arguments.

Though, doing argparse outside of the entry point method didn't work for me.

I had to do it inside the method.

I have no idea why? I will try it again in an hour, for now I was happy to be able to get it working.

Thanks

I will select your answer.

I will comment back here if it can be down outside of the entry method.