function_poc.py

"""
config.json
{
  "stats_key1": {
    "name": "Stats Key1",
    "compute": {
      "function": "calc_stats_key1",
      "args": {"name":  "test1", "age":  1}
    }
  },
  "stats_key2": {
    "name": "Stats Key2",
    "compute": {
      "function": "calc_stats_key2",
      "args": {"name":  "test2", "age":  2}
    }
  }
}
"""
import json
class C1:
    def __init__(self, df):
        self.df = df

    def calc_stats_key1(self, **kwargs):
        # just concat
        stats_value = kwargs["name"] + str(kwargs["age"])
        return {"stats_key1": stats_value}

    def calc_stats_key2(self, **kwargs):
        return {"stats_key2": kwargs["name"] + str(kwargs["age"])}

obj =  C1("dataframe")
func_ref_to_func_map = {"calc_stats_key1" : {"obj": obj, "func": C1.calc_stats_key1},
                        "calc_stats_key2" : {"obj": obj, "func": C1.calc_stats_key2}}

if __name__ == '__main__':
    with open('./config.json') as f:
        data = json.load(f)

    stats = {}
    for item in data.items():
        compute = item[1]["compute"]
        function_name = compute["function"]
        args = compute["args"]
        function_entry = func_ref_to_func_map[function_name]
        function_obj = function_entry["obj"]
        function_ref = function_entry["func"]
        stats.update(function_ref(function_obj, **args))

    print("Stats: ", stats)