[Python] What is the difference between == and is in Python? [duplicate]

I am working with Python and noticed a strange behavior when comparing two lists. For example:

a = [1, 2, 3]
b = [1, 2, 3]
print(a == b) # True
print(a is b) # False
​

Why does a == b return True, but a **is b return False? What is the difference between == and is? When should each be used?

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