passing specific key to to_dict pandas code example

Example 1: dataframe to dict without index

df.to_dict('index')

Example 2: 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++']}