Day 3:Confusing is with ==

 

🐍 Python Mistakes Everyone Makes ❌

Day 3: Confusing is with ==

One of the most common Python mistakes is confusing is with ==.
Although they look similar, they serve very different purposes.

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❌ The Mistake

a = 1000 

b = 1000 

print(a is b)

Many people expect this to return True, but it often doesn’t.

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❌ Why this fails?

Because is is an identity operator, not a comparison operator.

It checks whether both variables point to the same object in memory, not whether their values are equal.

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✅ The Correct Way

a = 1000
b = 1000

print(a == b)

✔ == compares values
✔ This is what you want in most cases

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🧠 Simple Rule to Remember

• == → compares value

• is → compares identity (memory location)

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✅ Key Takeaway

If you’re comparing numbers, strings, or collections,
use ==, not is.

Reserve is for checking None and other singletons.