How do I read a CSV file without headers in Pandas?

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You can use the following basic syntax to read a CSV file without headers into a pandas DataFrame:

df = pd.read_csv('my_data.csv', header=None)

The argument header=None tells pandas that the first row should not be used as the header row.

The following example shows how to use this syntax in practice.

Example: Read CSV Without Headers in Pandas

Suppose we have the following CSV file called players_data.csv:

From the file we can see that the first row does not contain any column names.

If we import the CSV file using the read_csv() function, pandas will attempt to use the first row as a header row:

import pandas as pd

#import CSV file
df = pd.read_csv('players_data.csv')

#view resulting DataFrame
print(df)

   A  22  10
0  B  14   9
1  C  29   6
2  D  30   2
3  E  22   9
4  F  31  10

However, we can specify header=None so that pandas knows not to use the first row as a header row:

import pandas as pd

#import CSV file without header
df = pd.read_csv('players_data.csv', header=None)

#view resulting DataFrame
print(df)

   0   1   2
0  A  22  10
1  B  14   9
2  C  29   6
3  D  30   2
4  E  22   9
5  F  31  10

Notice that the first row in the CSV file is no longer used as the header row.

Also notice that pandas uses a range of numerical values (0, 1, 2) by default as the column names.

To specify your own column names when importing the CSV file, you can use the names argument as follows:

import pandas as pd

#specify column names
cols = ['team', 'points', 'rebounds']

#import CSV file without header and specify column names
df = pd.read_csv('players_data.csv', header=None, names=cols)

#view resulting DataFrame
print(df)

  team  points  rebounds
0    A      22        10
1    B      14         9
2    C      29         6
3    D      30         2
4    E      22         9
5    F      31        10

The DataFrame now has the column names that we specified using the names argument.

The following tutorials explain how to perform other common tasks in Python: