DATA                              = "data"
JSON_DATA                         = "jsonData"
PENALIZATION_IMPUTATION_WEIGHTAGE = "penalizationImputationWeightage"

mltrainconfig_json = {
    "data" : {
        "jsonData" : {
            "penalizationImputationWeightage" : {
                "one" : "two"
            }
        }
    }
}

penalization_imputation_weightage = mltrainconfig_json.get(DATA, {})\
        .get(JSON_DATA, {})\
        .get(PENALIZATION_IMPUTATION_WEIGHTAGE, {})

penalization_imputation_weightage = penalization_imputation_weightage if penalization_imputation_weightage else imputing_factor_value

penalization_imputation_weightage

{'one': 'two'}

mltrainconfig_json = {
    "data" : {
        "jsonData" : {
            "penalizationImputationWeightage2" : {
                "one" : "two"
            }
        }
    }
}

imputing_factor_value = {
    "eleven" : "twelve"
}

penalization_imputation_weightage = mltrainconfig_json.get(DATA, {})\
        .get(JSON_DATA, {})\
        .get(PENALIZATION_IMPUTATION_WEIGHTAGE, {})

penalization_imputation_weightage

{}

penalization_imputation_weightage = penalization_imputation_weightage if penalization_imputation_weightage else imputing_factor_value

penalization_imputation_weightage

{'eleven': 'twelve'}