问题描述
我有以下代码,我想使用列表理解将其转换为一行?但是我一直没有成功转换它。
exp_days = ["16/04/2021","23/04/2021","27/04/2021"]
for i in range(len(df)):
if df["Date"][i] in exp_days:
list_of_days.append(1)
else:
list_of_days.append(0)
我的数据框:
Date
16/04/2021
19/04/2021
20/04/2021
21/04/2021
22/04/2021
23/04/2021
26/04/2021
27/04/2021
预期输出:
list_of_days = [1,1,1]
解决方法
list_of_days = [ 1 if df["Date"][i] in exp_days else 0 for i in range(len(df)) ]
,
通过 numpy 替代 -
exp_days = ["16/04/2021","23/04/2021","27/04/2021"]
import numpy as np
result = np.where(df['Date'].isin(exp_days),1,0)