Answers for "create dict from dataframe columns"

convert pandas dataframe to dict with a column as key

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

create a dataframe from dict

create a dataframe from dict (function)

import pandas as pd
def create_df():
    data = {'col_1': [3, 2, 1, 0], 'col_2': ['a', 'b', 'c', 'd']}
    return pd.DataFrame.from_dict(data)
create_df()