The code snippet explicitly defines the index to be 0, 1, 3. It may just be a typo, but if even simple examples are written sloppily, how can I trust the sheet:

The code snippet explicitly defines the index to be 0, 1, 3. It may just be a typo, but if even simple examples are written sloppily, how can I trust the sheet: df = pd.DataFrame( {'col_1': [11, 12, 13], 'col_2': [21, 22, 23]}, index=[0, 1, 3])