Day 20 Not using with for file handling

 

Day 20: Not Using with for File Handling

File handling is common in Python, but many developers forget to use the safest and cleanest approach.

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❌ The Mistake

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

This works only if everything goes right.
If an error occurs before file.close(), the file stays open.

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❌ Why This Fails

• Files consume system resources

• Forgetting close() causes resource leaks

• Can lead to file locks

• Makes error handling harder

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✅ The Correct Way

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

Using with ensures the file is always closed, even if an exception occurs.

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🧠 Simple Rule to Remember

✔ Always use with when working with files
✔ Safe, clean, and Pythonic