我有以下数据帧
+-----+--------------------------------------------------+---+
|asset|signals |ts |
+-----+--------------------------------------------------+---+
|2 |[D -> 1100, F -> 3000] |6 |
|1 |[D -> 500, System.Date -> 340] |5 |
|1 |[B -> 100, E -> 900, System.Date -> 310] |4 |
|1 |[B -> 110, C -> 200, System.Date -> 320] |3 |
|1 |[A -> 330, B -> 120, C -> 210, D -> 410, E -> 100]|2 |
+-----+--------------------------------------------------+---+
我需要将具有键值的 column:'signals' 投影到多个列，如下所示：
+-----+---+-----------+----+----+----+----+----+----+
|asset|ts |System.Date|F |E |B |D |C |A |
+-----+---+-----------+----+----+----+----+----+----+
|2 …