Day 30:Using == None Instead of is None

 

🐍 Python Mistakes Everyone Makes ❌

Day 30: Using == None Instead of is None

Checking for None looks simple, but using the wrong comparison can lead to subtle bugs.

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❌ The Mistake

value = None

if value == None:  
     print("Value is None")

This may work sometimes—but it’s not the correct way.

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❌ Why This Is a Problem

• ==checks value equality

• Objects can override __eq__()

• Comparison may return unexpected results

• None is a singleton, not a value to compare

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✅ The Correct Way

value = None

if value is None:  
    print("Value is None")

is checks identity, which is exactly what you want for None.

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✔ Key Takeaways

✔ None exists only once in memory
✔ Use is None and is not None
✔ Avoid == for None checks

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🧠 Simple Rule to Remember

🐍 Compare to None using is, not ==