class Base:
    def __init__(self, file):
        self.base = []
        self.col_names = file.readline().split(';')
        for line in file:
            s = line.split(';')
            self.base.append({self.col_names[i]: s[i] for i in range(len(self.col_names))})

    def __getitem__(self, item):
        return self.base[item]

    def __call__(self, *col_names):  # возвращает все элементы из выбранных колонок
        res = []
        for row in self.base:
            res.append({col_names[i]: self.base[col_names[i]] for i in range(len(col_names))})
        return res

    def __len__(self):
        return len(self.base)

    def __str__(self):
        return '; '.join(self.col_names) + '\n' + '\n'.join(['; '.join(row.items()) for row in self.base])