Skip to main content
TopMiniSite

Back to all posts

How to Merge Two Different Versions Same Dataframe In Python Pandas?

Published on
3 min read
How to Merge Two Different Versions Same Dataframe In Python Pandas? image

Best Python Dataframe Tools to Buy in October 2025

1 Python Polars: The Definitive Guide: Transforming, Analyzing, and Visualizing Data with a Fast and Expressive DataFrame API

Python Polars: The Definitive Guide: Transforming, Analyzing, and Visualizing Data with a Fast and Expressive DataFrame API

BUY & SAVE
$64.51 $79.99
Save 19%
Python Polars: The Definitive Guide: Transforming, Analyzing, and Visualizing Data with a Fast and Expressive DataFrame API
2 Learning the Pandas Library: Python Tools for Data Munging, Analysis, and Visualization (Treading on Python Book 12)

Learning the Pandas Library: Python Tools for Data Munging, Analysis, and Visualization (Treading on Python Book 12)

BUY & SAVE
$9.99
Learning the Pandas Library: Python Tools for Data Munging, Analysis, and Visualization (Treading on Python Book 12)
3 Introduction to Python Programming for Business and Social Science Applications

Introduction to Python Programming for Business and Social Science Applications

BUY & SAVE
$59.20
Introduction to Python Programming for Business and Social Science Applications
4 Effective Pandas: Patterns for Data Manipulation (Treading on Python)

Effective Pandas: Patterns for Data Manipulation (Treading on Python)

BUY & SAVE
$48.95
Effective Pandas: Patterns for Data Manipulation (Treading on Python)
5 Effective Pandas 2: Opinionated Patterns for Data Manipulation (Treading on Python Book 4)

Effective Pandas 2: Opinionated Patterns for Data Manipulation (Treading on Python Book 4)

BUY & SAVE
$49.00
Effective Pandas 2: Opinionated Patterns for Data Manipulation (Treading on Python Book 4)
6 50 Python Exercises NumPy & Pandas: A Practical Guide - Mastering DataFrames, Data Manipulation and Creating Graphs

50 Python Exercises NumPy & Pandas: A Practical Guide - Mastering DataFrames, Data Manipulation and Creating Graphs

BUY & SAVE
$9.99
50 Python Exercises NumPy & Pandas: A Practical Guide - Mastering DataFrames, Data Manipulation and Creating Graphs
7 Statistics and Data Visualisation with Python (Chapman & Hall/CRC The Python Series)

Statistics and Data Visualisation with Python (Chapman & Hall/CRC The Python Series)

BUY & SAVE
$62.99
Statistics and Data Visualisation with Python (Chapman & Hall/CRC The Python Series)
8 THE BEST 160 PRACTICE QUESTIONS PANDAS - PYTHON!!: Includes topics such as Data frames, Series, Export-Import between Pandas and SQL, SQLite, Excel, CSV ... comparison and real cases (Spanish Edition)

THE BEST 160 PRACTICE QUESTIONS PANDAS - PYTHON!!: Includes topics such as Data frames, Series, Export-Import between Pandas and SQL, SQLite, Excel, CSV ... comparison and real cases (Spanish Edition)

BUY & SAVE
$3.99
THE BEST 160 PRACTICE QUESTIONS PANDAS - PYTHON!!: Includes topics such as Data frames, Series, Export-Import between Pandas and SQL, SQLite, Excel, CSV ... comparison and real cases (Spanish Edition)
9 150 Ejercicios para Aprender Pandas.: Nivel Básico-Intermedio. (Spanish Edition)

150 Ejercicios para Aprender Pandas.: Nivel Básico-Intermedio. (Spanish Edition)

BUY & SAVE
$9.99
150 Ejercicios para Aprender Pandas.: Nivel Básico-Intermedio. (Spanish Edition)
+
ONE MORE?

To merge two different versions of the same dataframe in Python pandas, you can use the merge function. This function allows you to combine two dataframes based on a common column or index. You can specify how to merge the data, such as using inner, outer, left, or right join. By merging the two dataframes, you can combine the information from both versions into a single dataframe. This can be useful for comparing changes between versions or consolidating data from multiple sources.

How to handle conflicting column names during a merge in Python Pandas?

When merging two DataFrames in Python Pandas, if there are conflicting column names, you can handle it by using the suffixes parameter in the merge function.

For example, let's say you have two DataFrames df1 and df2 with some columns named A and B that conflict:

import pandas as pd

Create two DataFrames with conflicting column names

df1 = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]}) df2 = pd.DataFrame({'A': [7, 8, 9], 'B': [10, 11, 12]})

Merge the two DataFrames with a suffix for conflicting column names

merged_df = df1.merge(df2, on='A', suffixes=('_df1', '_df2'))

print(merged_df)

In this example, the suffixes=('_df1', '_df2') parameter in the merge function will add _df1 and _df2 as suffixes to the conflicting column names A and B in the merged DataFrame. This way, you can distinguish between the columns from the two original DataFrames.

Alternatively, you can also rename the conflicting columns before merging using the rename function:

# Rename columns before merging df1 = df1.rename(columns={'A': 'A_df1', 'B': 'B_df1'}) df2 = df2.rename(columns={'A': 'A_df2', 'B': 'B_df2'})

Merge the two DataFrames

merged_df = df1.merge(df2, on='A_df1')

By renaming the columns before merging, you can avoid conflicts and have full control over the column names in the merged DataFrame.

What is a merge key in Python Pandas?

A merge key in Python Pandas is a column or a set of columns used to combine or merge two DataFrames. It is essentially a common identifier that allows the DataFrames to be merged based on matching values in the specified columns. The merge key is used to align the rows from the two DataFrames that have the same values in the specified columns, resulting in a single merged DataFrame.

How to perform a right merge in Python Pandas?

To perform a right merge in Python Pandas, you can use the pd.merge() function with the how='right' parameter.

Here's an example:

import pandas as pd

Create two dataframes

df1 = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]}) df2 = pd.DataFrame({'A': [1, 2, 4], 'C': [7, 8, 9]})

Perform a right merge

merged_df = pd.merge(df1, df2, on='A', how='right')

print(merged_df)

In this example, df1 and df2 are merged on the 'A' column using a right merge. This will include all rows from df2 and only matching rows from df1.