Question 5

Correct answer: A

# First execute the following to create a file with already existing lines
with open('file', 'w') as f:
    for i in range(1, 6):
        f.write(str(i) + '. Line\n')
 
for x in open('file', 'rt'):
    print(x)

A. The code snippet iterates over the file object returned by the open() function using a for loop, which reads the file line by line. Each iteration of the loop will print a single line from the file.

B. The code snippet does not read the file character by character. Instead, it reads the file line by line due to the iteration over the file object. Reading the file character by character would require a different approach, such as using the read() method with a specified number of characters to read.

C. The code snippet does not read the entire file at once. Instead, it reads the file line by line due to the iteration over the file object. This approach is memory-efficient, especially for large files, as it does not load the entire file into memory.

D. The code snippet does not contain any operations that would cause an exception. As long as the file exists and can be successfully opened, the code will execute without any errors.