Chapter 7 Quiz

10?試題

1.?

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

Main Memory

Machine Language

Secondary memory

Motherboard

2.?

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

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

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

The handle contains the first 10 lines of a file

The handle is a connection to the file's data

3.?

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

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

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

How large we expect the file to be

What disk drive the file is stored on

4.?

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

file_input()

cin

read()

raw_input()

5.?

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

It enables random movement throughout the file

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

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

6.?

If we open a file as follows:

xfile = open('mbox.txt')

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

for line in xfile:

while ((line = xfile.readLine()) != null) {

while (<xfile>) {

while line = xfile.gets 7.?

What is the purpose of the following Python code?

fhand = open('mbox.txt') x = 0 for line in fhand:x = x + 1 print x

Reverse the order of the lines in mbox.txt

Count the lines in the file 'mbox.txt'

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

Convert the lines in mbox.txt to lower case

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?

From: stephen.marquard@uct.ac.zaFrom: louis@media.berkeley.eduFrom: zqian@umich.eduFrom: rjlowe@iupui.edu...

strip()

ljust()

find()

startswith()

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?

fname = raw_input('Enter the file name: ') fhand = open(fname)

setjmp / longjmp

try / catch / finally

try / except

signal handlers

10.?

What does the following Python code do?

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

Checks to see if the file exists and can be written

Prompts the user for a file name

Reads the entire file into the variable?inp as a string

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

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