CODEWITHSUNDEEP
pythoncsvindexingpandas
Alexis
Alexis

Reputation: 9171

How to avoid pandas creating an index in a saved csv

I am trying to save a csv to a folder after making some edits to the file.

Every time I use pd.to_csv('C:/Path of file.csv') the csv file has a separate column of indexes. I want to avoid printing the index to csv.

I tried: 

pd.read_csv('C:/Path to file to edit.csv', index_col = False)

And to save the file...

pd.to_csv('C:/Path to save edited file.csv', index_col = False)

However, I still got the unwanted index column. How can I avoid this when I save my files?

Upvotes: 773

Views: 892250

Answers (6)

Iván Rodríguez
Iván Rodríguez

Reputation: 201

If you want a good format next statement is the best:

dataframe_prediction.to_csv('filename.csv', sep=',', encoding='utf-8', index=False)

In this case you have got a csv file with ',' as separate between columns and utf-8 format. In addition, numerical index won't appear.

Upvotes: 20

amalik2205
amalik2205

Reputation: 4172

If you want no index, read file using:

import pandas as pd
df = pd.read_csv('file.csv', index_col=0)

save it using 

df.to_csv('file.csv', index=False)

Upvotes: 121

Lucas P.
Lucas P.

Reputation: 4532

As others have stated, if you don't want to save the index column in the first place, you can use df.to_csv('processed.csv', index=False)

However, since the data you will usually use, have some sort of index themselves, let's say a 'timestamp' column, I would keep the index and load the data using it.

So, to save the indexed data, first set their index and then save the DataFrame:

df.set_index('timestamp')
df.to_csv('processed.csv')

Afterwards, you can either read the data with the index:

pd.read_csv('processed.csv', index_col='timestamp')

or read the data, and then set the index:

pd.read_csv('filename.csv')
pd.set_index('column_name')

Upvotes: 34

Probably rgbkrk
Probably rgbkrk

Reputation: 11686

Use index=False.

df.to_csv('your.csv', index=False)

Upvotes: 1163

blitu12345
blitu12345

Reputation: 3567

There are two ways to handle the situation where we do not want the index to be stored in csv file.

  1. As others have stated you can use index=False while saving your
    dataframe to csv file.

    df.to_csv('file_name.csv',index=False)

  2. Or you can save your dataframe as it is with an index, and while reading you just drop the column unnamed 0 containing your previous index.Simple!

    df.to_csv(' file_name.csv ')
    df_new = pd.read_csv('file_name.csv').drop(['unnamed 0'],axis=1)

Upvotes: 137

khaled Fouda
khaled Fouda

Reputation: 359

Another solution if you want to keep this column as index. 

pd.read_csv('filename.csv', index_col='Unnamed: 0')

Upvotes: 20

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