Answers for "convert dataframe to dictionary with one column as key"

dataframe to dictionary with one column as key

pd.Series(df.A.values,index=df.B).to_dict()

pandas to dictionary

df.to_dict('records')

convert pandas dataframe to dict with a column as key

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

dataframe to dict without index

{'Name': ['John', 'Sara', 'John', 'Sara'],
 'Sem': ['Sem1', 'Sem1', 'Sem2', 'Sem2'],
 'Subject': ['Mathematics', 'Biology', 'Biology', 'Mathematics'],
 'Grade': ['A', 'B', 'A+', 'B++']}