Python: 'Invalid function type detected, unable to infer DelegateType. Function: (input: str, kernel: semantic_kernel.kernel.Kernel) -> semantic_kernel.orchestration.sk_context.SKContext', None)

[AliRaza190]

I want to return a json object from my native function but it doesn't returns that. Can anyone guide me how do I achieve that.I would prefer a python solution. The issue with native function in semantic kernel is that it can return only the follwing data types:

• int
• str
• None
• SKContext
  I want to return a SKContext object as it is not possible currently to return a JSON object . Can anyone help me on this ?

`
class CSVLoader:

def __init__(self,kernel:Kernel) -> None:
    self._kernel=kernel

@sk_function(
    description="This will load a CSV file and return the string",
    name="loadcsv",
    input_description="This is a string which is the filename of CSV file",
)
def LoadCSV(self, input: str,kernel:Kernel) -> 'SKContext':
    new_context=kernel.create_new_context()
    df=pd.read_csv(input["input"])
    for col in df.columns:
        if df[col].dtype == 'int64' or df[col].dtype == 'float64':
            df[col].fillna('', inplace=True)
        elif df[col].dtype == 'object' or df[col].dtype == 'datetime64' or df[col].dtype=='category' or df[col].dtype=='bool':
            df[col].fillna('', inplace=True)
    
    new_context=df.to_json()
    print('new',new_context)
    return new_context

`

[AdarshAcharya5]

I think the error here is due to multiple arguments (non SKContext params) in the function signature. To pass in multiple parameters, you can make use of context variables. Here's a similar issue #3364 . This notebook here might help you