Pandas DataFrame: Shuffle a given DataFrame rows

Last update on December 21 2024 07:42:06 (UTC/GMT +8 hours)

Write a Pandas program to shuffle a given DataFrame rows.
Sample data:
Original DataFrame:
attempts name qualify score
0 1 Anastasia yes 12.5
1 3 Dima no 9.0
2 2 Katherine yes 16.5
3 3 James no NaN
4 2 Emily no 9.0
5 3 Michael yes 20.0
6 1 Matthew yes 14.5
7 1 Laura no NaN
8 2 Kevin no 8.0
9 1 Jonas yes 19.0
New DataFrame:
attempts name qualify score
5 3 Michael yes 20.0
0 1 Anastasia yes 12.5
9 1 Jonas yes 19.0
6 1 Matthew yes 14.5
7 1 Laura no NaN
1 3 Dima no 9.0
3 3 James no NaN
4 2 Emily no 9.0
8 2 Kevin no 8.0
2 2 Katherine yes 16.5

Sample Solution :

Python Code :

import pandas as pd
import numpy as np
exam_data = {'name': ['Anastasia', 'Dima', 'Katherine', 'James', 'Emily', 'Michael', 'Matthew', 'Laura', 'Kevin', 'Jonas'],
        'score': [12.5, 9, 16.5, np.nan, 9, 20, 14.5, np.nan, 8, 19],
        'attempts': [1, 3, 2, 3, 2, 3, 1, 1, 2, 1],
        'qualify': ['yes', 'no', 'yes', 'no', 'no', 'yes', 'yes', 'no', 'no', 'yes']}
df = pd.DataFrame(exam_data)
print("Original DataFrame:")
print(df)
df = df.sample(frac=1)
print("\nNew DataFrame:")
print(df)

Sample Output:

Original DataFrame:
   attempts       name qualify  score
0         1  Anastasia     yes   12.5
1         3       Dima      no    9.0
2         2  Katherine     yes   16.5
3         3      James      no    NaN
4         2      Emily      no    9.0
5         3    Michael     yes   20.0
6         1    Matthew     yes   14.5
7         1      Laura      no    NaN
8         2      Kevin      no    8.0
9         1      Jonas     yes   19.0

New DataFrame:
   attempts       name qualify  score
5         3    Michael     yes   20.0
0         1  Anastasia     yes   12.5
9         1      Jonas     yes   19.0
6         1    Matthew     yes   14.5
7         1      Laura      no    NaN
1         3       Dima      no    9.0
3         3      James      no    NaN
4         2      Emily      no    9.0
8         2      Kevin      no    8.0
2         2  Katherine     yes   16.5               

Explanation:

The said code first creates a Pandas DataFrame df from the dictionary ‘exam_data’. The DataFrame contains information about students' names, scores, number of attempts and whether they qualify or not.

df = df.sample(frac=1): This code shuffles the rows of the Pandas DataFrame df randomly using the sample method with frac=1, which means to sample all rows. It essentially reorders the rows of the DataFrame randomly.

The original DataFrame is ‘exam_data’. The DataFrame has 4 columns, namely name, score, attempts, and qualify. Each column has 10 elements. The sample method is used to shuffle the rows of this DataFrame in a random order.

Python-Pandas Code Editor:

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