import pandas as pd


class Selector:
    def select(self, codes: [str], df: pd.DataFrame) -> [str]:
        return codes


class Score:
    def score(self, codes: [str], df: pd.DataFrame) -> [(str, int)]:
        return list(map(lambda code: (code, 0), codes))


class PeriodSelector(Selector):
    def __init__(self, period: int = 5):
        self.__period = period

    def select(self, codes: [str], df: pd.DataFrame) -> [str]:
        size_df = df.groupby("code").size()
        return list(filter(lambda code: size_df[code] > self.__period, codes))