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Pandas: Create a multi Index frame using two columns and using an Index and a column

Pandas Indexing: Exercise-2 with Solution

Write a Pandas program to create a multi Index frame using two columns and using an Index and a column.

Test Data:

0        s001     V  Alberto Franco     15/05/2002      35  street1   t1
1        s002     V    Gino Mcneill     17/05/2002      32  street2   t2
2        s003    VI     Ryan Parkes     16/02/1999      33  street3   t3
3        s001    VI    Eesha Hinton     25/09/1998      30  street1   t4
4        s002     V    Gino Mcneill     11/05/2002      31  street2   t5
5        s004    VI    David Parkes     15/09/1997      32  street4   t6

Sample Solution:

Python Code :

import pandas as pd
df = pd.DataFrame({
    'school_code': ['s001','s002','s003','s001','s002','s004'],
    'class': ['V', 'V', 'VI', 'VI', 'V', 'VI'],
    'name': ['Alberto Franco','Gino Mcneill','Ryan Parkes', 'Eesha Hinton', 'Gino Mcneill', 'David Parkes'],
    'date_Of_Birth': ['15/05/2002','17/05/2002','16/02/1999','25/09/1998','11/05/2002','15/09/1997'],
    'weight': [35, 32, 33, 30, 31, 32],
    'address': ['street1', 'street2', 'street3', 'street1', 'street2', 'street4'],
    't_id':['t1', 't2', 't3', 't4', 't5', 't6']})
print("Original DataFrame:")
print(df)
print("\nMultiIndex using columns 't_id' and ‘school_code’:")
df1 = df.set_index(['t_id', 'school_code'])
print(df1)
print("\nMultiIndex using an Index and a column:")
df2 = df.set_index([pd.Index([0, 1, 2, 3, 4, 5]), 't_id'])
print(df2)

Sample Output:

Original DataFrame:
  school_code class            name date_Of_Birth  weight  address t_id
0        s001     V  Alberto Franco    15/05/2002      35  street1   t1
1        s002     V    Gino Mcneill    17/05/2002      32  street2   t2
2        s003    VI     Ryan Parkes    16/02/1999      33  street3   t3
3        s001    VI    Eesha Hinton    25/09/1998      30  street1   t4
4        s002     V    Gino Mcneill    11/05/2002      31  street2   t5
5        s004    VI    David Parkes    15/09/1997      32  street4   t6

MultiIndex using columns 't_id' and ‘school_code’:
                 class            name date_Of_Birth  weight  address
t_id school_code                                                     
t1   s001            V  Alberto Franco    15/05/2002      35  street1
t2   s002            V    Gino Mcneill    17/05/2002      32  street2
t3   s003           VI     Ryan Parkes    16/02/1999      33  street3
t4   s001           VI    Eesha Hinton    25/09/1998      30  street1
t5   s002            V    Gino Mcneill    11/05/2002      31  street2
t6   s004           VI    David Parkes    15/09/1997      32  street4

MultiIndex using an Index and a column:
       school_code class            name date_Of_Birth  weight  address
  t_id                                                                 
0 t1          s001     V  Alberto Franco    15/05/2002      35  street1
1 t2          s002     V    Gino Mcneill    17/05/2002      32  street2
2 t3          s003    VI     Ryan Parkes    16/02/1999      33  street3
3 t4          s001    VI    Eesha Hinton    25/09/1998      30  street1
4 t5          s002     V    Gino Mcneill    11/05/2002      31  street2
5 t6          s004    VI    David Parkes    15/09/1997      32  street4        

Python Code Editor:


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Python: Tips of the Day

For-else construct useful when searched for something and find it:

# For example assume that I need to search through a list and process each item until a flag item is found and 
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for i in mylist:
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else:
    raise ValueError("List argument missing terminal flag.")