how to delete rows in pandas that are in another dataframe code example

Example 1: delete a row in pandas dataframe

df.drop(df.index[2])

Example 2: delete rows in a table that are present in another table pandas

print (pd.merge(a,b, indicator=True, how='outer')
         .query('_merge=="left_only"')
         .drop('_merge', axis=1))
   0   1
0  1  10
2  3  30