Python基于另一个变量（熊猫）在数据框中生成虚拟对象

Question

I have dataframe with many variables. I would like to generate a dummy variable based on column 1, for example. If column 1's observation is more than 0.25 then the dummy variable is filled with 1. If column 1' observation is less than 0.25, then the dummy variable is filled with 0. Any ideas? Thanks a lot.

Answer 1

IIUC compare values for greater like 0.25 and then cast to integers for map True/False to 1/0 :

df[1] = df[1].gt(0.25).astype(int)

If first column:

df.iloc[:, 0] = df.iloc[:, 0].gt(0.25).astype(int)