I am using colab and below is the code

import pandas as pd
import numpy as np
import os
import csv

data = pd.read_file(r'C:\Users\sd3394\Test\CAN_all.csv')
data.head()

Why is the letter r in the line with pd.read_file()?

The letter "r" identifies the string as a raw string. This allows entering a path & file name with single backslashes instead of having to escape them (double backslashes).

Try using

pd.read_csv
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