python convert a dataframe to a dictionary code example

Example 1: how to make a pandas dataframe from a dictionary

>>> data = {'col_1': [3, 2, 1, 0], 'col_2': ['a', 'b', 'c', 'd']}
>>> pd.DataFrame.from_dict(data)

Example 2: convert pandas dataframe to dict with a column as key

df.set_index('columnName').T.to_dict()