Deck 6: Files and Exceptions

Question 1

Which of the following describes what happens when a piece of data is written to a file?

A) The data is copied from a variable in RAM to a file.
B) The data is copied from a variable in the program to a file.
C) The data is copied from the program to a file.
D) The data is copied from a file object to a file.

Answer 1

A

Question 2

In Python,there is nothing that can be done if the program tries to access a file to read that does not exist.

Answer 2

False

Question 3

The ZeroDivisionError exception is raised when the program attempts to perform the calculation x/y if y = 0.

Answer 3

True

Question 4

Which mode specifier will open a file but not let you change the file or write to it?

A) 'w'
B) 'r'
C) 'a'
D) 'e'

Question 5

A single piece of data within a record is called a

A) variable
B) delimiter
C) field
D) data bit

Question 6

An exception handler is a piece of code that is written using the try/except statement.

Question 7

Which mode specifier will erase the contents of a file if it already exists and create the file if it does not already exist?

A) 'w'
B) 'r'
C) 'a'
D) 'e'

Question 8

Which type of file access jumps directly to a piece of data in the file without having to read all the data that comes before it?

A) sequential
B) random
C) numbered
D) text

Question 9

How many types of files are there?

A) one
B) two
C) three
D) more than three

Question 10

Closing a file disconnects the communication between the file and the program.

Question 11

A(n)__________ access file is also known as a direct access file.

A) sequential
B) random
C) numbered
D) text

Question 12

If the last line in a file is not terminated with \n,the readline method will return the line without \n.

Question 13

Which step creates a connection between a file and a program?

A) open the file
B) read the file
C) process the file
D) close the file

Question 14

Python allows the programmer to work with text and number files.

Question 15

Strings can be written directly to a file with the write method,but numbers must be converted to strings before they can be written.

Question 16

When a piece of data is read from a file,it is copied from the file into the program.

Question 17

Which of the following is associated with a specific file and provides a way for the program to work with that file?

A) the filename
B) the file extension
C) the file object
D) the file variable

Question 18

What is the process of retrieving data from a file called?

A) retrieving data
B) reading data
C) reading input
D) getting data

Question 19

If a file with the specified name already exists when the file is opened and the file is opened in 'w' mode,then an alert will appear on the screen.

Question 20

It is possible to create a while loop that determines when the end of a file has been reached.

Question 21

Which statement can be used to handle some of the runtime errors in a program?

A) an exception statement
B) a try statement
C) a try/except statement
D) an exception handler statement

Question 22

What will be the output after the following code is executed and the user enters 75 and -5 at the first two prompts?

A) ERROR: cannot have 0 items
B) ERROR: cannot have 0 items
ERROR: number of items can't be negative
C) ERROR: number of items can't be negative
D) Nothing; there is no print statement to display average. The ValueError will not catch the error.

Question 23

If data is retrieved from a file by a program,this is known by the term __________ file.

Question 24

When a program needs to save data for later use,it writes the data in a(n)___________.

Question 25

Which method could be used to strip specific characters from the end of a string?

A) estrip
B) rstrip
C) strip
D) remove

Question 26

Which of the following is the correct way to open a file named users.txt in 'r' mode?

A) infile = open('r', users.txt)
B) infile = read('users.txt', 'r')
C) infile = open('users.txt', 'r')
D) infile = readlines('users.txt', r)

Question 27

When data is written to a file,it is described as a(n)__________ file.

Question 28

A(n)__________ gives information about the line number(s)that caused an exception.

Question 29

Programmers usually refer to the process of __________ data in a file as writing data to the file.

Question 30

A(n)___________ block includes one or more statements that can potentially raise an exception.

Question 31

A(n)__________ file contains data that has not been converted to text.

Question 32

A filename __________ is a short sequence of characters that appear at the end of a filename,preceded by a period.

Question 33

Which of the following is the correct way to open a file named users.txt to write to it?

A) outfile = open('w', users.txt)
B) outfile = write('users.txt', 'w')
C) outfile = open('users.txt', 'w')
D) outfile = open('users.txt')

Question 34

Which method will return an empty string when it has attempted to read beyond the end of a file?

A) read
B) getline
C) input
D) readline

Question 35

What will be the output after the following code is executed and the user enters 75 and 0 at the first two prompts?

A) ERROR: cannot have 0 items
B) ERROR: number of items can't be negative
C) 0
D) Nothing; there is no print statement to display average.

Question 36

Given that the customer file references a file object,and the file was opened using the 'w' mode specifier,how would you write the string 'Mary Smith' to the file?

A) customer file.write('Mary Smith')
B) customer.write('w', 'Mary Smith')
C) customer.input('Mary Smith')
D) customer.write('Mary Smith')

Question 37

A(n)___________ file contains data that has been encoded as text,using a scheme such as ASCII.

Question 38

A(n)___________ access file retrieves data from the beginning of the file to the end of the file.

Question 39

Which method could be used to convert a numeric value to a string?

A) str
B) value
C) num
D) chr

Question 40

When a file has been opened using the 'r' mode specifier,which method will return the file's contents as a string?

A) write
B) input
C) get
D) read