Remove rows with similar values

Question

I want to remove all rows where Column "a" value = Column "b" value from the DataFrame like this:

    a   b
1 AAA BBB
2 AAA CCC
3 AAA AAA
4 CCC CCC
5 CCC BBB
6 CCC DDD

Desired output:

     a  b
1 AAA BBB
2 AAA CCC
3 CCC BBB
4 CCC DDD

Answer 1

In [93]: df.loc[df.a.ne(df.b)]
Out[93]:
     a    b
1  AAA  BBB
2  AAA  CCC
5  CCC  BBB
6  CCC  DDD

keep the rows where "a" values are not equal to the "b" values.