基于 if 条件 pandas 从仅列中提取所有值作为列表

Question

Suppose I have a dataframe with three columns:

Host    DB    Status
001     A     ONLINE
001     B     ONLINE
001     C     OFFLINE
001     D     OFFLINE

I want list of all DB's which have status as offline. I cant do loop as I am getting this data in a loop for each server and at the same time after getting I need to clean it.

In output I want [C,D]

I tried this:

temp_df.loc[temp_df.STATE=="OFFLINE","Status"]["DB"]

But this is not working

Answer 1

Try this:

print(df[df['Status']=='OFFLINE']['DB'].tolist())
['C', 'D']

Answer 2

Fix your code

temp_df.loc[temp_df.Status=="OFFLINE","DB"].to_numpy()