在pandas中,给定一个DataFrame D:
+-----+--------+--------+--------+
| | 1 | 2 | 3 |
+-----+--------+--------+--------+
| 0 | apple | banana | banana |
| 1 | orange | orange | orange |
| 2 | banana | apple | orange |
| 3 | NaN | NaN | NaN |
| 4 | apple | apple | apple |
+-----+--------+--------+--------+
当有三列或更多列时,如何返回其所有列中具有相同内容的行,以便它返回:
+-----+--------+--------+--------+
| | 1 | 2 | 3 |
+-----+--------+--------+--------+
| 1 | orange | orange | orange |
| 4 …