在 Pandas 中加入两个数据帧，从另一个 dataframe 中删除值

Question

I have two dataframes tran and user

I need to get output dataframe as tran dataframe have a UserID not in users.

Expected Output

Answer 1

If I understood you right:

tran[~tran.UserID.isin(users.UserID)]

will give you tran df with only the user ids that are not user df

Answer 2

Easily you can use sqldf :

from pandasql import sqldf
pysqldf = lambda q: sqldf(q, globals())
pysqldf("SELECT tran.*  
         FROM tran 
         WHERE‌ tran.UserId NOT IN‌ (SELECT‌ UserId FROM users)") \
.head()

Answer 3

You could try this -

tran_filt = tran[~(tran['UserId'].isin(users['UserId'].tolist()))]