Vinit Khandelwal

🐍 When you open a file, you are required to close it too. If between your open statement and close statement there are n other statements, and in any of the statement an error occurs, your program won't reach the point to close the file. It will remian opened. Try this to understand the issue. Input f = open('some_file.txt', 'a') f.readlines() f.close() Output UnsupportedOperation Error Input f.write('add more text to test if file is open') Output 37 The above example shows that at line 2 an error occurred and the program didn't reach line 3 to close the file. Later we wrote something to the file and it worked, which means the file is still open. Run the close statement again to close it. Input f.close() Protect the file with try/except/finally One solution to this is use of try/except/finally statements as follows. Input f.open('some_file.txt', 'a') try: f.readlines() except: print('An exception was raised.') finally: ...