ExamAdept

How can you append a list of numbers to a binary file named "data.bin"?

A:

with open("data.bin", "wb") as file:
    numbers = [1, 2, 3, 4, 5]
    file.write(bytes(numbers))

B:

append_binary("data.bin", [1, 2, 3, 4, 5])

C:

with open("data.bin", "ab") as file:
    numbers = [1, 2, 3, 4, 5]
    file.write(numbers)

D:

binary_append("data.bin", [1, 2, 3, 4, 5])

Answer: A

Using open() in binary write mode and bytes() to write a list of numbers to a binary file.

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What is the purpose of the file.flush() method?

A:

Writes the buffered data to the file

B:

Closes the file

C:

Reads the file content

D:

Moves the file cursor to the beginning

Answer: A

file.flush() writes the buffered data to the file.

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How can you read and print the lines containing both "Python" and "programming" from a file named "code.txt"?

A:

with open("code.txt", "r") as file:
    lines = file.readlines()
    for line in lines:
        if "Python" in line and "programming" in line:
            print(line)

B:

print_python_programming_lines("code.txt")

C:

with open("code.txt", "r") as file:
    print(file.read("Python programming"))

D:

with open("code.txt", "r") as file:
    for line in file:
        if "Python" in line:
            print(line)
        elif "programming" in line:
            print(line)

Answer: A

Using in to check for both "Python" and "programming" in each line.

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How can you check if a file named "data.xml" is a valid XML file?

A:

if is_valid_xml("data.xml"):

B:

if is_xml_file("data.xml"):

C:

if validate_xml("data.xml"):

D:

if os.path.isxml("data.xml"):

Answer: B

Checking if a file has an XML extension to determine if it's a valid XML file.

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What does the os.path.getctime() function return?

A:

Returns the file's creation time

B:

Returns the file's size in bytes

C:

Returns the file's absolute path

D:

Returns the file's modification time

Answer: A

os.path.getctime() returns the creation time of a file.

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Questions for: Reading And Writing Files