Chapter 13 - Files and Exception Handling - Section 13.2 - Text Input and Output - Check Point - MyProgrammingLab - Page 448: 13.2

Here single backslashes(\) are usen in the path string, in python \ is special character used in string formatting so we can not use them directly in a string, to use a backslash we need to put two backslash together like \\. So we can correct the given code by writing infile = open("c:\\book\\test.txt", "r")

Same as above.