Reading And Writing Files

Exercise: Reading And Writing Files

How can you append the string "new content" to an existing file named "existing_file.txt"?

open("existing_file.txt", "a").write("new content")

open("existing_file.txt", "w").write("new content")

append_content("existing_file.txt", "new content")

with open("existing_file.txt", "a") as file:
    file.append("new content")

Answer: A

The mode "a" in open() is used for appending content to an existing file.

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What does the os.path.isfile() function check?

Checks if a path exists

Checks if a file is a binary file

Checks if a file is empty

Checks if a path points to a regular file

Answer: D

os.path.isfile() checks if a path points to a regular file (not a directory).

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How can you read and print only the lines containing the word "Python" from a file named "text.txt"?

lines = open("text.txt").readlines()
    for line in lines:
    if "Python" in line:
        print(line)

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

print_python_lines("text.txt")

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

Answer: B

Using a for loop to iterate through the lines and printing lines containing "Python".

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What is the purpose of the shutil.copy() function?

To move a file

To copy the contents of a file

To create a new file

To remove a file

Answer: B

shutil.copy() is used to copy the contents of a file to another location.

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How can you read the content of a binary file named "binary_data.dat"?

content = open("binary_data.dat").read()

content = open("binary_data.dat", "rb").read()

content = read_binary("binary_data.dat")

content = open_binary("binary_data.dat").read()

Answer: B

To read the content of a binary file, the file should be opened with mode "rb".

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