ExamAdept

What does the file.fileno() method return?

A:

Returns the file's size in bytes

B:

Returns the file's access mode

C:

Returns the file's file descriptor

D:

Returns the file's encoding

Answer: C

file.fileno() returns the file's file descriptor.

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How can you read and print the lines containing the word "success" or "failure" from a log file named "logfile.txt"?

A:

with open("logfile.txt", "r") as file:
    lines = file.readlines()
    for line in lines:
        if "success" in line.lower() or "failure" in line.lower():
            print(line)

B:

print_log_lines("logfile.txt", ["success", "failure"])

C:

with open("logfile.txt", "r") as file:
    print(file.read("success" or "failure"))

D:

with open("logfile.txt", "r") as file:
    for line in file:
        if "success".casefold() in line or "failure".casefold() in line:
            print(line)

Answer: A

Using line.lower() to make the comparison case-insensitive.

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What does the file.encoding attribute represent?

A:

Represents the file's access mode

B:

Represents the file's size in bytes

C:

Represents the file's encoding (character set)

D:

Represents the file's creation time

Answer: C

file.encoding represents the file's encoding.

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How can you check if a file named "output.txt" is empty?

A:

if is_empty("output.txt"):

B:

if os.path.getsize("output.txt") == 0:

C:

if file.isempty("output.txt"):

D:

if check_empty("output.txt"):

Answer: B

Using os.path.getsize() to check if the file size is 0, indicating an empty file.

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How can you write a list of tuples to a binary file named "data.bin"?

A:

with open("data.bin", "wb") as file:
    tuples = [(1, 'a'), (2, 'b'), (3, 'c')]
    file.write(pickle.dumps(tuples))

B:

binary_write("data.bin", [(1, 'a'), (2, 'b'), (3, 'c')])

C:

with open("data.bin", "ab") as file:
    tuples = [(1, 'a'), (2, 'b'), (3, 'c')]
    file.write(tuples)

D:

write_binary("data.bin", [(1, 'a'), (2, 'b'), (3, 'c')])

Answer: A

Using open() in binary write mode and pickle.dumps() to write a list of tuples to a binary file.

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Questions for: Reading And Writing Files