How to Prevent Pandas from Adding an Index Column when Saving a CSV?

Avoiding Index Column in Saved CSV with Pandas

When saving a csv file after making modifications using Pandas, the default behavior is to include an index column. To avoid this, one can set the index parameter to False when using the to_csv() method.

To elaborate, consider the following sequence of commands:

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

This command reads a csv file and suppresses the index column.

df.to_csv('C:/Path/to/edited/file.csv', index=False)

This command saves the modified DataFrame df to a new csv file without the index column.

Technical Details

The index parameter in the to_csv() method controls whether the index column is included in the output csv. By setting it to False, the index is omitted.

Example

Suppose you have a DataFrame named df containing the following data:

Index	Value
0	10
1	20
2	30

Saving df with index:

df.to_csv('with_index.csv')

Output:

Index	Value
0	10
1	20
2	30

Saving df without index:

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

Output:

Value

10

20

30

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