Python | Pandas Dataframe.sample()

Python is a great language for doing data analysis, primarily because of the fantastic ecosystem of data-centric python packages. Pandas is one of those packages and makes importing and analyzing data much easier.

Pandas sample() is used to generate a sample random row or column from the function caller data frame.

Syntax:

DataFrame.sample(n=None, frac=None, replace=False, weights=None, random_state=None, axis=None)

Parameters:



n: int value, Number of random rows to generate.
frac: Float value, Returns (float value * length of data frame values ). frac cannot be used with n.
replace: Boolean value, return sample with replacement if True.
random_state: int value or numpy.random.RandomState, optional. if set to a particular integer, will return same rows as sample in every iteration.
axis: 0 or ‘row’ for Rows and 1 or ‘column’ for Columns.

Return type: New object of same type as caller.

To download the CSV file used, Click Here.

Example #1: Random row from Data frame

In this example, two random rows are generated by the .sample() method and compared later.

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# importing pandas package
import pandas as pd
  
# making data frame from csv file 
data = pd.read_csv("employees.csv")
  
# generating one row 
row1 = data.sample(n = 1)
  
# display
row1
  
# generating another row
row2 = data.sample(n = 1)
  
# display
row2

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Output:

As shown in the output image, the two random sample rows generated are different from each other.




 

Example #2:  Generating 25% sample of data frame

In this example, 25% random sample data is generated out of the Data frame.













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# importing pandas package 


import pandas as pd 


  


# making data frame from csv file  


data = pd.read_csv("employees.csv") 


  


# generating one row  


rows = data.sample(frac =.25) 


  


# checking if sample is 0.25 times data or not 


  


if (0.25*(len(data))== len(rows)): 


    print( "Cool") 


    print(len(data), len(rows)) 


  


# display 


rows 



















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Output:

As shown in the output image, the length of sample generated is 25% of data frame. Also the sample is generated randomly.







    

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