pandas loc not in code example

Example 1: pandas loc index not in

df.loc[set(df.index) - set(blacklist)]

Example 2: syntax for loc in python

12       29.6
38       29.6
76       29.6
93       29.6
172      29.6
         ... 
31097    29.6
36812    29.6
38278    29.6
41460    29.6
45698    29.6
Name: mass, Length: 107, dtype: float64