w3resource

Pandas: RIGTH OUTER JOIN, Use keys from right dataframe only

Pandas Joining and merging DataFrame: Exercise-9 with Solution

Write a Pandas program to join two dataframes using keys from right dataframe only.

Test Data:

data1:
  key1 key2   P   Q
0   K0   K0  P0  Q0
1   K0   K1  P1  Q1
2   K1   K0  P2  Q2
3   K2   K1  P3  Q3
data2:
  key1 key2   R   S
0   K0   K0  R0  S0
1   K1   K0  R1  S1
2   K1   K0  R2  S2
3   K2   K0  R3  S3

Sample Solution:

Python Code :

import pandas as pd
data1 = pd.DataFrame({'key1': ['K0', 'K0', 'K1', 'K2'],
                     'key2': ['K0', 'K1', 'K0', 'K1'],
                     'P': ['P0', 'P1', 'P2', 'P3'],
                     'Q': ['Q0', 'Q1', 'Q2', 'Q3']}) 
data2 = pd.DataFrame({'key1': ['K0', 'K1', 'K1', 'K2'],
                      'key2': ['K0', 'K0', 'K0', 'K0'],
                      'R': ['R0', 'R1', 'R2', 'R3'],
                      'S': ['S0', 'S1', 'S2', 'S3']})
print("Original DataFrames:")
print(data1)
print("--------------------")
print(data2)
print("\nMerged Data (keys from data2):")
merged_data = pd.merge(data1, data2, how='right', on=['key1', 'key2'])
print(merged_data)
print("\nMerged Data (keys from data1):")
merged_data = pd.merge(data2, data1, how='right', on=['key1', 'key2'])
print(merged_data)

Sample Output:

Original DataFrames:
  key1 key2   P   Q
0   K0   K0  P0  Q0
1   K0   K1  P1  Q1
2   K1   K0  P2  Q2
3   K2   K1  P3  Q3
--------------------
  key1 key2   R   S
0   K0   K0  R0  S0
1   K1   K0  R1  S1
2   K1   K0  R2  S2
3   K2   K0  R3  S3

Merged Data (keys from data2):
  key1 key2    P    Q   R   S
0   K0   K0   P0   Q0  R0  S0
1   K1   K0   P2   Q2  R1  S1
2   K1   K0   P2   Q2  R2  S2
3   K2   K0  NaN  NaN  R3  S3

Merged Data (keys from data1):
  key1 key2    R    S   P   Q
0   K0   K0   R0   S0  P0  Q0
1   K1   K0   R1   S1  P2  Q2
2   K1   K0   R2   S2  P2  Q2
3   K0   K1  NaN  NaN  P1  Q1
4   K2   K1  NaN  NaN  P3  Q3        

Python Code Editor:


Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Pandas program to join (left join) the two dataframes using keys from left dataframe only.
Next: Write a Pandas program to merge two given datasets using multiple join keys.

What is the difficulty level of this exercise?

Test your Python skills with w3resource's quiz



Python: Tips of the Day

How to sort a Python dict by value

Example:

x1 = {'a': 5, 'b': 7, 'c': 9, 'd': 1}

sorted(x1.items(), key=lambda x: x[1])
[('d', 1), ('c', 9), ('b', 7), ('a', 5)]

# Or:

import operator
print(sorted(x1.items(), key=operator.itemgetter(1)))

Output:

[('d', 1), ('a', 5), ('b', 7), ('c', 9)]