This error occurs because you are using a normal string as a path. You can use one of the three following solutions to fix your problem:
1: Just put r before your normal string it converts normal string to raw string:
pandas.read_csv(r"C:\Users\DeePak\Desktop\myac.csv")
2:
pandas.read_csv("C:/Users/DeePak/Desktop/myac.csv")
3:
pandas.read_csv("C:\\Users\\DeePak\\Desktop\\myac.csv")