Re: 오늘의 마지막 문제. boston.csv 를 불러와서 boston ....

[22기_김예찬]

```

import pandas as pd


class DS:
    def __init__(self, ds):
        self.ds = ds
        self._row = []
        self._col = []

    def show(self):
        if not self._row and not self._col:
            return self.ds.loc[:,:]
        elif not self._row and self._col:
            return self.ds.loc[:,self._col]
        elif self._row and not self._col:
            return self.ds.loc[self._row,:]
        else:
            return self.ds.loc[self._row,self._col]

    def col(self, *cnames):
        for cname in cnames:
            if cname not in self._col:
                self._col.append(cname)
        return self

    def where(self, fn):
        self.ds = self.ds.loc[fn(self.ds),:]
        return self


boston = pd.read_csv("C:\data/boston.csv")

(
    DS(boston)
    .where(lambda x: ~x["price"].between(10, 30))
    .show()
)

```