how to select columns by index in pandas code example

Example 1: isolate row based on index pandas

dfObj.iloc[: , [0, 2]]

Example 2: pandas df by row index

indices = [133, 22, 19, 203, 14, 1]
df_by_indices = df.iloc[indices, :]

Example 3: iloc and loc

iloc - default indexes (system generated)
loc - table indexes or we manually given indexes