Find the list values not in pandas dataframe data

Question

I have a list and pandas dataframe data that looks like this:

user_id = [10, 15, 20, 25, 30, 32, 40, 45, 50]

user_id  value 
10        45 
20        49 
25             


        

Answer 1

Use a set operation:

list(set(user_id)-set(df.user_id))
Out[84]: [40, 50, 45, 15]