(self)
| 139 | return not any(item != self._fill_value for item in col) |
| 140 | |
| 141 | def to_csv(self) -> str: |
| 142 | import csv |
| 143 | from io import StringIO |
| 144 | |
| 145 | buff = StringIO() |
| 146 | writer = csv.writer(buff) |
| 147 | writer.writerow(self.keys()) |
| 148 | |
| 149 | for row in self: |
| 150 | writer.writerow(row) |
| 151 | return buff.getvalue() |
| 152 | |
| 153 | def add_column(self, name: str) -> None: |
| 154 | self._columns[name] = Column([self._fill_value] * len(self)) |