Python Programming - Reading and Writing Files

Exercise : Reading and Writing Files - General Questions

91.

How can you read and print the last 3 lines from a file named "data.txt"?

with open("data.txt", "r") as file:
    lines = file.readlines()
    print(lines[-3:])

print_last_lines("data.txt", 3)

with open("data.txt", "r") as file:
    print(file.read(-3))

with open("data.txt", "r") as file:
    for line in file:
        print(line[-3:])

Answer: Option

Explanation:

Using lines[-3:] to get the last 3 lines from the list of lines.

92.

What does the file.seek() method do?

Moves the file cursor to a specified position

Reads the entire file content

Closes the file

Moves the file cursor to the beginning

Answer: Option

Explanation:

file.seek() moves the file cursor to a specified position.

93.

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

if is_writable("output.txt"):

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

if os.access("output.txt", os.W_OK):

if check_writable("output.txt"):

Answer: Option

Explanation:

Using os.access() with the os.W_OK flag to check if the file is writable.

94.

What is the purpose of the file.mode attribute?

Represents the file's modification time

Represents the file's size in bytes

Represents the file's access mode (read, write, etc.)

Represents the file's encoding (character set)

Answer: Option

Explanation:

file.mode represents the file's access mode.

95.

How can you write a dictionary to a JSON file named "data.json"?

with open("data.json", "w") as file:
    json.dump(my_dict, file)

write_json("data.json", my_dict)

with open("data.json", "w") as file:
    file.write(json.dumps(my_dict))

write_to_json("data.json", my_dict)

Answer: Option

Explanation:

Using json.dump() to write a dictionary to a JSON file.

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