Reading And Writing Files

Exercise: Reading And Writing Files

How can you read and print the lines that end with "!" from a file named "text.txt"?

with open("text.txt", "r") as file:
    lines = file.readlines()
    for line in lines:
        if line.endswith("!"):
            print(line)

print_lines_with_end("text.txt", "!")

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

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

Answer: A

Using endswith() to filter and print lines ending with "!".

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How can you check if a file named "config.ini" exists?

if isfile("config.ini"):

if exists("config.ini"):

if file_exists("config.ini"):

if os.path.file_exists("config.ini"):

Answer: B

Using exists() to check if a file exists.

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How can you copy a file named "source.txt" to a new location and rename it as "destination.txt"?

copy_file("source.txt", "destination.txt")

shutil.copy("source.txt", "destination.txt")

with open("destination.txt", "w") as dest:
    dest.write(open("source.txt").read())

rename_file("source.txt", "destination.txt")

Answer: B

Using shutil.copy() to copy and rename a file.

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What does the shutil.rmtree() function do?

Removes a file

Removes a directory and its contents

Renames a file

Copies a directory

Answer: B

shutil.rmtree() removes a directory and its contents recursively.

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How can you read and print only the lines longer than 20 characters from a file named "data.txt"?

with open("data.txt", "r") as file:
    lines = file.readlines()
    for line in lines:
        if len(line) > 20:
            print(line)

print_long_lines("data.txt", 20)

with open("data.txt", "r") as file:
    print(file.read(20))

lines = open("data.txt").readlines()
for line in lines:
    if line.length() > 20:
        print(line)

Answer: A

Using len() to filter and print lines longer than 20 characters.

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