ExamAdept

How can you read and print the first 10 characters from a file named "sample.txt"?

A:

with open("sample.txt", "r") as file:
    print(file.read(10))

B:

first_ten_chars("sample.txt")

C:

with open("sample.txt", "r") as file:
    print(file.readline(10))

D:

chars = open("sample.txt").read(10)
print(chars)

Answer: A

Using read(10) to read and print the first 10 characters of the file.

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How can you check if a file named "data.csv" is empty?

A:

if not is_empty("data.csv"):

B:

if get_size("data.csv") == 0:

C:

if file_empty("data.csv"):

D:

if os.path.getsize("data.csv") == 0:

Answer: D

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

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What is the purpose of the os.path.abspath() function?

A:

Returns the file's absolute path

B:

Returns the file's relative path

C:

Returns the file's base name

D:

Returns the file's directory name

Answer: A

os.path.abspath() returns the absolute path of a file.

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How can you read and print the last 5 lines from a file named "log.txt"?

A:

with open("log.txt", "r") as file:
    lines = file.readlines()
    for line in lines[-5:]:
        print(line)

B:

last_five_lines("log.txt")

C:

with open("log.txt", "r") as file:
    print(file.read()[-5:])

D:

lines = open("log.txt").readlines()[-5:]
for line in lines:
    print(line)

Answer: A

Using readlines() and list slicing to get the last 5 lines.

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

A:

Returns the creation time of a file

B:

Returns the file extension

C:

Returns the size of a file in bytes

D:

Returns the number of lines in a file

Answer: C

os.path.getsize() returns the size of a file in bytes.

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Questions for: Reading And Writing Files