Answered: Add a command to this chapter's case…

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter8: Arrays And Strings

Section: Chapter Questions

Problem 6PE

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Question

# add your condition here

def viewFile(dirName):

# write your code here

print("")

def listCurrentDir(dirName):

"""Prints a list of the cwd's contents."""

lyst = os.listdir(dirName)

for element in lyst:print(element)

def moveUp():

"""Moves up to the parent directory."""

os.chdir("..")

def moveDown(currentDir):

"""Moves down to the named subdirectory if it exists."""

newDir = input("Enter the directory name: ")

if os.path.exists(currentDir + os.sep + newDir) and\

os.path.isdir(newDir):

os.chdir(newDir)

else:

print("ERROR: no such name")

def countFiles(path):

"""Returns the number of files in the cwd and

all its subdirectories."""

count = 0

lyst = os.listdir(path)

for element in lyst:

if os.path.isfile(element):

count += 1

else:

os.chdir(element)

count += countFiles(os.getcwd())

os.chdir("..")

return count

def countBytes(path):

"""Returns the number of bytes in the cwd and

all its subdirectories."""

count = 0

lyst = os.listdir(path)

for element in lyst:

if os.path.isfile(element):

count += os.path.getsize(element)

else:

os.chdir(element)

count += countBytes(os.getcwd())

os.chdir("..")

return count

def findFiles(target, path):

"""Returns a list of the file names that contain

the target string in the cwd and all its subdirectories."""

files = []

lyst = os.listdir(path)

for element in lyst:

if os.path.isfile(element):

if target in element:

files.append(path + os.sep + element)

else:

os.chdir(element)

files.extend(findFiles(target, os.getcwd()))

os.chdir("..")

return files

if __name__ == "__main__":

main()

Python only!

Add a command to this chapter's case study program that allows the user to view the contents of a
file in the current working directory. When the command is selected, the program should display a
list of filenames and a prompt for the name of the file to be viewed.
Be sure to include error recovery in the program. If the user enters a filename that does not exist
they should be prompted to enter a filename that does exist.
An example of the program input and output is shown below:
/root/sandbox
List the current directory
2
Move up
Move down
4
Number of files in the directory
Size of the directory in bytes
Search for a file name
View the contents of a file
6
7
8
Quit the program
Enter a number: 7
Files in /root/sandbox:
filesys.py
example.txt
Enter a file name from these names: example.txt
THIS IS CONTENT OF AN EXAMPLE FILE.
/root/sandbox
1
List the current directory
Move up
3
Move down
4
Number of files in the directory
Size of the directory in bytes
Search for a file name
5
6
7
View the contents of a file
Quit the program
Enter a number: 8
Have a nice day!

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