Exercise: Reading And Writing Files

Questions for: Reading And Writing Files

How can you create a new directory named "data_folder" in the current working directory?
A: 
os.mkdir("data_folder")
B: 
create_directory("data_folder")
C: 
shutil.new_dir("data_folder")
D: 
os.create_folder("data_folder")
Answer: A
Using os.mkdir() to create a new directory.
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How can you read and print the lines containing the word "error" from a log file named "logfile.txt"?
A: 
with open("logfile.txt", "r") as file:
    lines = file.readlines()
    for line in lines:
        if "error" in line.lower():
            print(line)
B: 
print_error_lines("logfile.txt")
C: 
with open("logfile.txt", "r") as file:
    print(file.read("error"))
D: 
with open("logfile.txt", "r") as file:
    for line in file:
        if "error".casefold() in line:
            print(line)
Answer: A
Using line.lower() to make the comparison case-insensitive.
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What does the file.writelines(lines) method do?
A:
Writes a single line to the file
B:
Writes multiple lines to the file from a list
C:
Writes the entire content of another file
D:
Writes a specific number of characters to the file
Answer: B
file.writelines(lines) writes multiple lines to the file from a list.
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How can you read and print the first word from each line in a file named "text.txt"?
A: 
with open("text.txt", "r") as file:
    for line in file:
        print(line.split()[0])
B: 
print_first_words("text.txt")
C: 
with open("text.txt", "r") as file:
    print(file.readline().split()[0])
D: 
with open("text.txt", "r") as file:
    print(file.read(1).split()[0])
Answer: A
Using line.split()[0] to get the first word from each line.
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How can you copy the contents of a text file named "source.txt" to another text file named "destination.txt"?
A: 
with open("source.txt", "r") as source, open("destination.txt", "w") as dest:
    dest.write(source.read())
B: 
copy_text_file("source.txt", "destination.txt")
C: 
shutil.copyfile("source.txt", "destination.txt")
D: 
duplicate_content("source.txt", "destination.txt")
Answer: A
Using with statement to open both files and copy the content.
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