Need to merge 2 pipe delimited files after converting it into json

The below code is not working. its unable retrieve Record count and merge files

Class Util

{

ClassMethod zPyRecordCount(inputfile) As %Integer [ Language = python ]

{

    import pandas as pd

    import iris

    import io

    try:

        df = pd.read_csv(inputfile, sep='|')

        recordcount=len(df.index)

        sys.stdout.write(len(df.index))

        return recordcount

    except Exception as e:

        return 0

}

ClassMethod zPymergefiles(file1, file2, outputfilename) As %Boolean [ Language = python ]

{

    import pandas as pd

    import iris

    import io

    try:

        dataframe1=pd.read_csv(file1, sep='|')

        dataframe2=pd.read_csv(file2, sep='|')

        jsondf1 = dataframe1.to_json(orient='records', indent=0)

        jsondf2 = dataframe2.to_json(orient='records', indent=0)

        mergedjsondf=pd.concat([jsondf1, jsondf2], ignore_index=True)

        with open(outfilename, 'w', encoding='utf-8') as f:

            json.dump(data, f, indent=0, ensure_ascii=False)

        return 1

    except Exception as e:

        return 0

}

}

Set mergeStatus=##class(Util).zPymergefiles(inputfile1,inputfile2, "outfile1.json")