将2D numpy数组转换为数据帧行

仅将Dataframe构造函数与参数列一起使用：

df = pd.Dataframe(a, columns=['a'])print (df) a0   26.8540651   27.8540652   28.8540653   29.8540654   30.8540655   31.8540656   32.8540657   33.8540658   34.8540659   35.85406510  36.85406511  37.85406512  38.85406513  39.85406514  40.85406515  41.854065