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df[pd.notnull(df[df.columns[INDEX]])]
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df.dropna(axis=1, how='all')
A B D
0 NaN 2.0 0
1 3.0 4.0 1
2 NaN NaN 5
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List<String> list = new ArrayList
(Arrays.asList("Java",null,"Python",null, "Ruby"));
CollectionUtils.filter
(list, PredicateUtils.notNullPredicate()); ==> removes nulls
System.out.println(list);