how to change a dataframe to dict code example

Example 1: convert a dictionary into dataframe python

import pandas as pd
data = {'col_1': [3, 2, 1, 0], 'col_2': ['a', 'b', 'c', 'd']}
pd.DataFrame.from_dict(data, orient='index').T

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

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