Subtracting A Pandas DataFrame From Another DataFrame

Overview:

  • Python pandas library provides multitude of functions to work on two dimensioanl Data through the DataFrame class.
  • The sub() method of pandas DataFrame subtracts the elements of one DataFrame from the elements of another DataFrame.
  • Invoking sub() method on a DataFrame object is equivalent to calling the binary subtraction operator(-).
  • The sub() method supports passing a parameter for missing values(np.nan, None).

Example:

import pandas as pd

 

# Create Data

data1 = [(2, 4, 6, 8),

         (1, 3, 5, 7),

         (5, 0, 0, 9)];

 

data2 = [(1, 1, 0 , 1),

         (1, 0, 1 , 1),

         (0, 1, 1 , 0)];

 

# Construct DataFrame1        

dataFrame1 = pd.DataFrame(data=data1);

print("DataFrame1:");

print(dataFrame1);

 

# Construct DataFrame2

dataFrame2 = pd.DataFrame(data=data2);

print("DataFrame2:");

print(dataFrame2);

 

# Subtracting DataFrame2 from DataFrame1

subtractionResults = dataFrame1 - dataFrame2;

print("Result of subtracting dataFrame1 from dataFrame2:");

print(subtractionResults);

 

Output:

DataFrame1:

   0  1  2  3

0  2  4  6  8

1  1  3  5  7

2  5  0  0  9

DataFrame2:

   0  1  2  3

0  1  1  0  1

1  1  0  1  1

2  0  1  1  0

Result of subtracting dataFrame1 from dataFrame2:

   0  1  2  3

0  1  3  6  7

1  0  3  4  6

2  5 -1 -1  9

 


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