我有一个像这样的数据框:
data = pd.DataFrame([NaN, NaN, NaN, 0.5, 1.2, 2.7, 3.8, NaN, NaN, 0.1, 0.7, 2.3, NaN, NaN, NaN, NaN, NaN, 0.01, 0.4, 1.5, 2.8, 4.5, 5.6, NaN, NaN, NaN, NaN, NaN, NaN])
我需要创建的额外列应该如下所示:
data = pd.DataFrame([NaN, NaN, NaN, 1, 1, 1, 1, NaN, NaN, 2, 2, 2, NaN, NaN, NaN, NaN, NaN, 3, 3, 3, 3