Deck 8: Text Files

Question 1

Text file is a file containing only printable characters.

Answer 1

False

Question 2

The newline character causes a new line of text to begin when displayed on the screen.

Answer 2

True

Question 3

A text file can be directly displayed on the screen.

Answer 3

True

Question 4

Binary files are structured as separate lines as with text file, but can contain numerical data and therefore cannot be directly displayed on the screen.

Question 5

Which of the following is not true of text files.

A) text files contain printable (displayable) characters
B) text files contain nonprinting characters
C) text files are structured as lines of text
D) text files can be directly displayed on the screen
E) text files cannot contain numeric characters

Question 6

A ___________________ is a file containing characters structured as lines of text, as well as nonprinting characters such as \n, the newline character.

Question 7

A ___________________ is a file containing various types of data, such as numerical data, and is not structured as lines of text.

Question 8

All files must first be opened before they can be read from or written to.

Question 9

in Python, files are accessed through method calls to an object associated with the open file.

Question 10

To open a file in Python for reading, the openRead function is called and passed the name of the file to open.

Question 11

When a program opens a file in Python, the file must reside in the same directory (folder) as the program in order to be found.

Question 12

A file may be closed and then reopened, with reading starting at the beginning of the file.

Question 13

To open a file for writing in Python, 'w' is used to indicate that any existing file of the same name should be written over, and 'a' is used to indicate that the output should be appended to an existing file.

Question 14

It is more likely that an error may occur when opening a file for writing than when opening a file for reading.

Question 15

Although files should be closed after being opened for either reading or writing. it is especially important to close a file that is open for writing.

Question 16

When reading from a text file, the readline method is used, which returns all the characters on the current line of the file, up to but not including the newline character.

Question 17

When the end-of-file is reached when reading from a text file, an error is generated.

Question 18

When writing a line of text to a text file, the write method does not add a newline character to the output string.

Question 19

Fundamental operations of files in include opening a file, _______ a file, __________ a file, and___________ a file.

Question 20

To open a file for reading, the built-in _________ method is used, called with an optional second parameter of ____.

Question 21

To open a file for writing, the built-in _________ method is used, called with a required second parameter of ____.

Question 22

When opening a file for reading, an error that may occur is ______________________________.

Question 23

When reading a line from a text file, the ________________ method is used.

Question 24

24. When reading a line from a text file, all the characters up to and including the ___________ character are read and returned.

Question 25

The ___________ method is used to write to a text file.

Question 26

When writing to or reading from to a file, data is placed in an area of memory called a __________, which make the reading and writing of files more efficient.

Question 27

Provide Python code that opens a file named names.txt, in which each line of the file contains a friends name in the form firstname lastname, and displays each of the names on the screen, one per screen line.

Question 28

Provide Python code that prompts the user for the file name of the form filename.txt of a text file, opens the file, and displays each of the names on the screen, one per screen line.

Question 29

Provide Python code that prompts the user for the file name of the form filename.txt of a text file, opens the file, and writes the contents of the file to a new file name filename-2.txt.

Question 30

Any of the sequence methods of Python may be applied to strings.

Question 31

Strings are immutable in Python, and therefore cannot be altered.

Question 32

Any string method involving the modification of a string returns a new string containing the modification, with the original string the method is called on unchanged.

Question 33

Collectively, the operations performed on strings is called _______________________.

Question 34

The ________ string method in Python can be used to determine if a string contains only letters, whereas the __________ method can be used determine is a string contains only digits.

Question 35

The ________ and __________ string methods in Python can be used to determine if a string contains only lowercase or uppercase characters, whereas the __________ and ___________ methods can be used to convert a string to all lowercase or all uppercase characters.

Question 36

Give Python code that displays the longer of two names, name1 and name2.

Question 37

Give Python code that display "Valid SSN" if the string assigned to variable SSN is a valid social security number, and displays "Invalid SSN" otherwise. A social security number is valid if it contains exactly nine digits, and no other characters.

Question 38

Give Python code that removes any occurrences of dashes from a given social security number that variable SSN is assigned to, and updates SSN to contain the dash-removed result.

Question 39

Give Python code that, for any state of the U.S. assigned to variable state_name, displays the name ensuring that the first letter is displayed capitalized.

Question 40

Give Python code that, for a first name and last name assigned to variable full_name with the first and last name separated by a single space (e.g., Alice Morgan), displays the first name only.

Question 41

Give Python code that for a first name and last name assigned to variable full_name with the first and last name separated by a single space (e.g., Alice Morgan), assigns the first name to variable first_name and the last name to variable last_name.

Question 42

An exception is an object that is raised when an unexpected situation has occurred.

Question 43

All raised exceptions should be able to be caught and handled to keep a program executing.

Question 44

Python contains a predefined set of exceptions called standard exceptions.

Question 45

Exceptions that are thrown by a given function must be caught by the function to gracefully handle errors.

Question 46

Exceptions must be caught and handled by the calling code of the function throwing the exceptions.

Question 47

If an exception is thrown all the back to the main module and not handled there, the program terminates.

Question 48

The section of code making a call to any function that raises an exception must be contained in a try suite (block).

Question 49

An exception handler is the section of code that is executed when a particular exception type is caught.

Question 50

Which of the following is not a standard exception in Python?

A) ImportError
B) IndexError
C) AssignmentError
D) TypeError
E) ValueError

Question 51

An exception is a value (object) that is __________ when an exceptional situation occurs.

Question 52

The predefined exceptions in Python are called the ____________ exceptions.

Question 53

The expression 'Hello' + 10 would raise a _________________ exception on Python.

Question 54

The expression int('10A') would raise a ________________ exception on Python.

Question 55

55. The section of code that is to be executed when a particular exception has been caught is called an _____________________________.

Question 56

Give section of code that prompts the user for an integer value, and displays the number entered if no exception is raised, otherwise catches the exception when a non-numeric character is entered, displaying the message "non-digit found in input."

Question 57

Write a function called getNum(start, end) that is passed the starting and ending values of a range of integers, prompts the user to enter an integer in the specified range, and returns the integer entered. The function should throw a ValueError exception if the entered number is not within the required range.

Question 58

Write a function called getYearOfBirth that prompts the user to enter their year of birth as a four-digit number, and returns the year entered. The function should throw a ValueError exception if the entered number is not within the range 1900 to the present year. Write a program that call this function, and keeps calling it until a valid year has been entered.