Python File Close

Why Should We Close a File?

When working with files in Python, it is important to close a file after you are done with it. Closing a file ensures:

If you don't close a file, it can cause data loss, memory leaks, or locked files.

सभी buffered डेटा सही से लिखा और सहेजा जाता है।
फाइल द्वारा उपयोग किए गए सिस्टम संसाधन (जैसे मेमोरी और फाइल हैंडल) मुक्त हो जाते हैं।
अन्य प्रोग्राम या प्रक्रियाएं फाइल को सुरक्षित रूप से एक्सेस कर पाती हैं।

अगर फाइल को बंद नहीं किया गया तो डेटा खो सकता है, मेमोरी लीक हो सकती है, या फाइल लॉक हो सकती है।

file = open('example.txt', 'w')
file.write('Hello, World!')
file.close()

Output:
Writes 'Hello, World!' to example.txt and closes the file.

Always call close() to ensure data is saved and resources are freed.

file = open('example.txt', 'w')
file.write('Data without closing')
# forgot file.close() here!

Output:
Data may not be saved properly if close() is not called.

Without close(), buffered data might not be written to disk immediately.

with open('example.txt', 'w') as file:
    file.write('Auto closed file')

Output:
File is automatically closed after the with block ends.

Using with statement is safer and recommended to handle files.

file = open('example.txt', 'w')
file.close()
print(file.closed)

Output:
True

The closed attribute tells if the file is closed.

file = open('example.txt', 'w')
file.write('Hello')
file.close()
file = open('example.txt', 'r')
print(file.read())
file.close()

Output:
Hello

You can reopen a file after closing it to read or write again.