Remove one dataframe from another with Pandas

Question

I have two dataframes of different size (df1 nad df2). I would like to remove from df1 all the rows which are stored within df2<

Answer 1

Use merge with outer join with filter by query, last remove helper column by drop:

df = pd.merge(df1, df2, on=['A','B'], how='outer', indicator=True)
       .query("_merge != 'both'")
       .drop('_merge', axis=1)
       .reset_index(drop=True)
print (df)
     A  B  C
0  qwe  5  a
1  rty  9  f
2  iop  1  k