怎么实现将Pandas的DataFrame满足条件之后，合并成一列？
比如下面第一列相等的都横向合并：
3304939785114.0 A 33049.0 39785.0 1 4 3 75
3304939785114.0 A 33049.0 39785.0 1 4 14 75
3304939797114.0 A 33049.0 39797.0 1 4 3 75
3304939797114.0 A 33049.0 39797.0 1 4 14 75
3304939809114.0 A 33049.0 39809.0 1 4 14 75
3304939809114.0 A 33049.0 39809.0 1 4 3 75
3304939821114.0 A 33049.0 39821.0 1 4 14 75
3304939821114.0 A 33049.0 39821.0 1 4 3 75
3304939833114.0 A 33049.0 39833.0 1 4 3 75
3304939833114.0 A 33049.0 39833.0 1 4 14 75
3304939845114.0 A 33049.0 39845.0 1 4 3 75
3304939845114.0 A 33049.0 39845.0 1 4 14 75
3304939857114.0 A 33049.0 39857.0 1 4 14 75
https://blog.csdn.net/orangefly0214/article/details/80763441