8.12. Multiple Choice Questions

Q-1: Which of the following can be used to open a file called myText.txt in read-only mode?

• infile = open("myText.txt", “w”)
• This will open in write-only mode.
• infile = open("myText.txt", r)
• The r must be in quotes.
• infile = open("myText.txt", “read”)
• Use "r" for read-only mode.
• infile = open("myText.txt")
• The default is read if no mode is specified

Q-2: Which of the following can be used to open a file called myText.txt in write-only mode?

• outfile = open("myText.txt", w)
• The w must be in quotes.
• outfile = open("myText.txt", “write”)
• Use "w" for write-only mode.
• outfile = open("myText.txt", “w”)
• This will open the file in write-only mode.
• outfile = open("myText.txt")
• This would open the file in read-only mode.

Q-3: Which command below closes the already open file myText.txt if the following code has already been written?

ref_file = open("myText.txt", "r")

• close()
• You must call this method on the file object.
• ref_file.close()
• This closes the file using the variable it has been assigned to.
• close(ref_file)
• The command close() needs to be called on the file object using dot notation.
• close("myText")
• The command close() needs to be called on the file object using dot notation.

Q-4: Which of the commands below is used to add the following string to the end of a file object filevar?

somestring = "my Sentence"

• filevar.append(somestring)
• Append is a command used for lists, not files.
• filevar.write("somestring")
• somestring is a variable and does not need quotation marks around it.
• filevar.write(somestring)
• Using dot notation, we can call the write command with the string variable inside the parentheses.
• somestring.write()
• The command write() needs to be called on the file object, not the string itself.

Q-5: The contents of names.txt is listed here:

Moana
Cinderella
Tiana

Which of the following code blocks will print all of the names in names.txt?

I

names = open("names.txt", "r")
for line in names:
    print(names)

II

names = open("names.txt", "r")
for line in names:
    print(line)

III

names = open("names.txt", "r")
for line in names:
    print("line")

• I
• Append is a command used for lists, not files.
• II
• somestring is a variable and does not need quotation marks around it.
• III
• Using dot notation, we can call the write command with the string variable inside the parentheses.
• None of the above.

Q-6: What keyword do you use to specify code to execute if there is an error when the body of the try executes?

• catch
• This is used in other languages, but not in Python
• except
• Use except to execute code when an error occurs.
• exception
• Close, but it is shorter.
• error
• Try again.

Q-7: How many errors are in the code below? It should open the file in read-only mode, read each line and print each line and then close the file.

def print_contents(file)
    file_obj = open(file)
    for line in "file_obj":
        print(line_obj)

• 1
• Try again
• 2
• Try again
• 3
• Try again
• 4
• The first line is missing a ":", the third shouldn't have file_obj in quotes, the fourth should use line rather than line_obj, and the close is missing.

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