Save Pandas DataFrame to csv file without index

In this article, we will discuss multiple ways to save a pandas DataFrame to CSV without an index.

Table of Contents

Introduction

Python panda’s library provides a function to save the pandas DataFrame as CSV.

pandas.DataFrame.to_csv(path_or_buf, sep, index, ....)

It accepts a few more arguments as well but here we will discuss a few important arguments only i.e.

Arguments:
– path_or_buf : string containing file path including filename and “.csv” at the end
– sep : field delimiter, default is “,” (to save it as CSV)
– index : True will keep the indexes while False will drop them while saving

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To quickly get started, let’s create a sample dataframe to experiment. We’ll use the pandas library with some random data.

import pandas as pd

# List of Tuples
employees = [('Shubham', 'India', 'Tech India',   5),
            ('Riti', 'India', 'India' ,   7),
            ('Shanky', 'India', 'PMO' ,   2),
            ('Shreya', 'India', 'Design' ,   2),
            ('Aadi', 'US', 'Tech', 11),
            ('Sim', 'US', 'Tech', 4)]

# Create a DataFrame object from list of tuples
df = pd.DataFrame(employees,
                  columns=['Name', 'Location', 'Team', 'Experience'])
print(df)

Contents of the created dataframe are,

      Name Location        Team  Experience
0  Shubham    India  Tech India           5
1     Riti    India       India           7
2   Shanky    India         PMO           2
3   Shreya    India      Design           2
4     Aadi       US        Tech          11
5      Sim       US        Tech           4

Let’s discuss different ways to save a pandas DataFrame to CSV without an index.

Method 1: Using the “index” attribute

The simplest way to store the pandas DataFrame as a CSV file without an index is to set the “index” attribute as False in the to_csv function. Let’s save the above df as a CSV without index.

# save the DataFrame without index
df.to_csv("file.csv", index=False)

The output of the file looks like as below.

Contents of the file file.csv will be,

Name,Location,Team,Experience
Shubham,India,Tech India,5
Riti,India,India,7
Shanky,India,PMO,2
Shreya,India,Design,2
Aadi,US,Tech,11
Sim,US,Tech,4

It will save the pandas dataframe to file.csv without index. Please check the contents of file.csv file. There should be no index present in the CSV file saved.

Method 2: Replace the index with any column while saving csv file

Another alternate method is to first replace the index with the first column and then save the pandas DataFrame as CSV. Let’s set the index as the values from the “Name” column here and then save it using the to_csv function.

# set index as Name column
df.set_index("Name", inplace=True)

# save the DataFrame (here we don't need to set index attribute)
df.to_csv("file.csv")

Contents of the file file.csv will be,

Name,Location,Team,Experience
Shubham,India,Tech India,5
Riti,India,India,7
Shanky,India,PMO,2
Shreya,India,Design,2
Aadi,US,Tech,11
Sim,US,Tech,4

Here you go, the output again doesn’t contain any index column. Note that, when we will read this file again, the Name column will be available as a column only and not an index.

It will save the pandas dataframe to file.csv without index. Please check the contents of file.csv file. There should be no index present in the CSV file saved.

The complete example is as follows,

import pandas as pd

# List of Tuples
employees = [('Shubham', 'India', 'Tech India',   5),
            ('Riti', 'India', 'India' ,   7),
            ('Shanky', 'India', 'PMO' ,   2),
            ('Shreya', 'India', 'Design' ,   2),
            ('Aadi', 'US', 'Tech', 11),
            ('Sim', 'US', 'Tech', 4)]

# Create a DataFrame object from list of tuples
df = pd.DataFrame(employees,
                  columns=['Name', 'Location', 'Team', 'Experience'])

print(df)

# save the DataFrame without index
df.to_csv("file.csv", index=False)

# set index as Name column
df.set_index("Name", inplace=True)

# save the DataFrame (here we don't need to set index attribute)
df.to_csv("file.csv")

Summary

In this article, we have discussed multiple ways to save the pandas DataFrame as CSV without an index.

Pandas Tutorials -Learn Data Analysis with Python

   

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