我的原始数据帧如下所示，ItemId包含ItemID的列表：
Index ItemID
538935 [5H9241070, 5I9242410]
538936 [5I9320910, 5I9710520]
538937 [7I9400230, 7I9400230]
538938 [5I0280220]
538939 [9I9230350, 9I9310960]
538940 [9I0311260, 9I8230470, 9I823280T]
538941 [9I7310860]
538942 [9I9322220]
538943 [9I8200560]
538944 [5I0820050]
538945 [5I0820340, 5I0310420]
538946 [5I9820040]
请如何像上面的数据框一样转换上面的数据框？
Index ItemID_1 ItemID_2 ItemID_3....
538935 5H9241070 5I9242410 np.nan
538936 5I9320910 5I9710520 np.nan
538937 7I9400230 7I9400230 np.nan
538938 5I0280220 np.nan np.nan
538939 9I9230350 9I9310960 np.nan
538940 9I0311260 9I8230470 9I823280T
538941 9I7310860 np.nan np.nan
538942 9I9322220 np.nan np.nan
538943 9I8200560 np.nan np.nan
538944 5I0820050 np.nan np.nan
538945 5I0820340 5I0310420 np.nan
538946 5I9820040 np.nan np.nan