我想知道如何替换管道方法中从第二行开始的值(连接到其余步骤).
import pandas as pd
import numpy as np
df = pd.DataFrame(
{
"Date": ["2020-01-01", "2021-01-01", "2022-01-01"],
"Pop": [90, 70, 60],
}
)
Date Pop
0 2020-01-01 90
1 2021-01-01 70
2 2022-01-01 60
当前解决方案
df.iloc[1:] = np.nan
预期yields
Date Pop
0 2020-01-01 90
1 2021-01-01 NaN
2 2022-01-01 NaN