Using Python You just finished administering the final exam for all of the stude

Question

Using Python

You just finished administering the final exam for all of the students in the "Introduction to Computer Programming" classes this semester. The exam was a 25 question multiple choice exam, and it is your job to grade the exams. You have all of the scores stored in a series of text files.

To begin, download the data files and store them in a folder on your computer. Then create a new Python program inside of this folder. Make sure your source code file is inside of the same folder as the data files you just downloaded!

Next, write a program that lets the user type in the name of a file. Attempt to open the supplied file for read access. If the file exists you can print out a confirmation message. If the file doesn't exist you should tell the user that the file cannot be found and keep asking until the user enters a valid file name.

How to check whether a file exists There are two reasonably simple ways to check whether a file exists: Use Python's standard OS module Use a try/except block

We will not accept assignments that do not use one of these two techniques. Sample output

Here's a sample running of the program:

Enter a class file to grade (i.e. class1 for class1.txt): foobar

File cannot be found.

Enter a class file to grade (i.e. class1 for class1.txt): class1

Successfully opened class1.txt

Explanation / Answer

working python code for this check compiled on ideone.

I am using the os module way to check for the existence of the file. working code below:

import os.path
filename=raw_input("Please enter the file name in the current directory")
if os.path.isfile(filename):
   print "Successfully opened" + filename
else:
   print "File cannot be found"

Related Questions

Navigate

• Browse (All)
• Browse U
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.