Merging DataFrames with different join column names in Pandas

Last update on December 21 2024 09:15:01 (UTC/GMT +8 hours)

Pandas: Custom Function Exercise-8 with Solution

Write a Pandas program to merge different column names in DataFrames.

In this exercise, we have merged two DataFrames where the column names we want to join on are different in each DataFrame.

Sample Solution :

Code :

import pandas as pd

# Create two sample DataFrames with different join column names
df1 = pd.DataFrame({
    'Employee_ID': [1, 2, 3],
    'Name': ['Selena', 'Annabel', 'Caeso']
})

df2 = pd.DataFrame({
    'ID': [1, 2, 3],
    'Salary': [50000, 60000, 70000]
})

# Merge the DataFrames, specifying different column names for the join
merged_df = pd.merge(df1, df2, left_on='Employee_ID', right_on='ID')

# Output the result
print(merged_df)

Output:

   Employee_ID     Name  ID  Salary
0            1   Selena   1   50000
1            2  Annabel   2   60000
2            3    Caeso   3   70000          

Explanation:

• Created two DataFrames df1 and df2 with different column names for the join ('Employee_ID' and 'ID').
• Used pd.merge() with the left_on and right_on arguments to specify which columns to join on.
• The result merges the DataFrames based on the specified column names.

Python-Pandas Code Editor:

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