Practical 2: Program to Access a File After It has been Closed.
Problem Statement
Write a Python program to demonstrate accessing a file after it has been closed. The program should raise an error or handle the exception that occurs when trying to perform operations on a closed file.
Solution Code
# Program to access a file after it is closed
# Open the file in read mode
file = open("sample.txt", "r")
# Read the content of the file
content = file.read()
print("File Content before closing:\n", content)
# Close the file
file.close()
# Attempting to read from the closed file (this will raise an error)
try:
content_after_close = file.read()
except ValueError as e:
print("\nError after closing the file:", e)
Output
- The program successfully reads the content of the file while it is open.
- After closing the file using file.close(), attempting to read from the file raises an error.
- The error is caught in the try-except block and an appropriate message is printed.
Example output:
File Content before closing:
these is the file
Error after closing the file: I/0 operation on closed file.
Process finished with exit code 0
Explanation
Below is the explanation of F.E. PPS Unit 4 Practical 2 solution where we have written Python program to demonstrate accessing a file after it has been closed.
- Opening and Reading the File:
- The file is opened using open(“sample.txt”, “r”) in read mode.
- The content of the file is read and printed using file.read().
- Closing the File:
- The file.close() method is called to close the file after reading.
- Attempting to Access the Closed File:
- After the file is closed, an attempt to read from it (file.read()) raises a ValueError.
- The error is caught in a try-except block, and the exception message is printed.
Key Concepts Learned
- File Closing:
- Understanding how files are closed using file.close().
- Handling Errors When Accessing Closed Files:
- Using a try-except block to handle exceptions when attempting operations on a closed file.
