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Pandas: Default index, Set an Index and Reset Index

Pandas Indexing: Exercise-3 with Solution

Write a Pandas program to display the default index and set a column as an Index in a given dataframe and then reset the index.

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("Default Index:")
print(df.head(10))
print("\nt_id as new Index:")
df1 = df.set_index('t_id')
print(df1)
print("\nReset the index:")
df2 = df1.reset_index(inplace=False)
print(df2)

Sample Output:

Default Index:
  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

t_id as new Index:
     school_code class            name date_Of_Birth  weight  address
t_id                                                                 
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

Reset the index:
  t_id school_code class            name date_Of_Birth  weight  address
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: Inspect an object in Python

Example:

test_obj = [1, 3, 5, 7]
print( dir(test_obj) )

Output:

['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', 
'__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__',
'__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__sizeof__', '__str__',
'__subclasshook__', 'append', 'clear', 'copy', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']