Py4e: Chapter 7 Questions & Answers
Given the architecture and terminology we introduced in Chapter 1, where are files
stored? - ANSWERSSecondary memory
What is stored in a "file handle" that is returned from a successful open() call? -
ANSWERSThe handle is a connection to the file's data
What do we use the second parameter of the open() call to indicate? -
ANSWERSWhether we want to read data from the file or write data to the file
What Python function would you use if you wanted to prompt the user for a file name to
open? - ANSWERSinput( )
What is the purpose of the newline character in text files? - ANSWERSIt indicates the
end of one line of text and the beginning of another line of text
If we open a file as follows:
xfile = open('mbox.txt') - ANSWERSfor line in xfile:
What is the purpose of the following Python code?
fhand = open('mbox.txt')
x = 0
for line in fhand:
x = x + 1
print(x) - ANSWERSCount the lines in the file 'mbox.txt'
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.za
From: louis@media.berkeley.edu
From: zqian@umich.edu
From: rjlowe@iupui.edu
... - ANSWERSrstrip( )
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 = input('Enter the file name: ')
