Day 12: Not closing files

 

🐍Python Mistakes Everyone Makes ❌

Day 12: Not Closing Files

Opening files is easy in Python—but forgetting to close them is a common mistake.

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❌ The Mistake

file = open("data.txt", "r")
content = file.read()

The file is opened but never closed.

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✅ The Correct Way

with open("data.txt", "r") as file:
    content = file.read()

Using with ensures the file is closed automatically.

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❌ Why This Fails?

Open files consume system resources.
If you don’t close them, it can lead to memory leaks and file locks.

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✔ What Can Go Wrong?

• Files may stay open longer than needed

• Can cause issues in larger applications

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🧠 Simple Rule to Remember

• Always use with open(...)

• Python will close the file for you