Python Data Structures - Chapter 7 Quiz

Chapter 7 Quiz

Quiz, 10 questions

Question 1

1
point

1. Question 1

Given the architecture and terminology we introduced in Chapter 1, where are files stored?

Machine Language

Motherboard

Secondary memory

Main Memory

Question 2

1
point

2. Question 2

What is stored in a "file handle" that is returned from a successful open() call?

The handle contains the first 10 lines of a file

All the data from the file is read into memory and stored in the handle

The handle is a connection to the file's data

The handle has a list of all of the files in a particular folder on the hard drive

Question 3

1
point

3. Question 3

What do we use the second parameter of the open() call to indicate?

What disk drive the file is stored on

Whether we want to read data from the file or write data to the file

The list of folders to be searched to find the file we want to open

How large we expect the file to be

Question 4

1
point

4. Question 4

What Python function would you use if you wanted to prompt the user for a file name to open?

input()

cin

file_input()

read()

Question 5

1
point

5. Question 5

What is the purpose of the newline character in text files?

It adds a new network connection to retrieve files from the network

It allows us to open more than one files and read them in a synchronized manner

It indicates the end of one line of text and the beginning of another line of text

It enables random movement throughout the file

Question 6

1
point

6. Question 6

If we open a file as follows:

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xfile = open('mbox.txt')

What statement would we use to read the file one line at a time?

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while ( getline (xfile,line) ) {

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READ (xfile,*,END=10) line

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while (<xfile>) {

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for line in xfile:

Question 7

1
point

7. Question 7

What is the purpose of the following Python code?

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fhand = open('mbox.txt')



x = 0



for line in fhand:



       x = x + 1



print(x)

Remove the leading and trailing spaces from each line in mbox.txt

Reverse the order of the lines in mbox.txt

Convert the lines in mbox.txt to lower case

Count the lines in the file 'mbox.txt'

Question 8

1
point

8. Question 8

If you write a Python program to read a text file and you see extra blank lines in the output that are not present in the file input as shown below, what Python string function will likely solve the problem?

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From: stephen.marquard@uct.ac.za



From: louis@media.berkeley.edu



From: zqian@umich.edu



From: rjlowe@iupui.edu



...

rstrip()

trim()

split()

ljust()

Question 9

1
point

9. Question 9

The following code sequence fails with a traceback when the user enters a file that does not exist. How would you avoid the traceback and make it so you could print out your own error message when a bad file name was entered?

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fname = input('Enter the file name: ')



fhand = open(fname)

try / except

signal handlers

setjmp / longjmp

begin / rescue / end

Question 10

1
point

10. Question 10

What does the following Python code do?

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fhand = open('mbox-short.txt')



inp = fhand.read()

Checks to see if the file exists and can be written

Reads the entire file into the variable inp as a string

Prompts the user for a file name

Turns the text in the file into a graphic image like a PNG or JPG