What built-in function calls __abs__?

All Questions From This Chapter

The built-in function abs() in Python calls the __abs__ dunder method on an object.

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✅ Example:

python
class Temperature:
    def __init__(self, value):
        self.value = value

    def __abs__(self):
        return abs(self.value)

temp = Temperature(-40)
print(abs(temp))  # Output: 40

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🔍 What’s Happening:

When you write abs(temp), Python internally calls:

python
temp.__abs__()

This allows you to define custom behavior for abs() on your own classes.

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🧠 Summary:

• abs(obj) → Calls obj.__abs__()

• You must implement __abs__ if you want your custom class to support abs()

This is part of Python’s data model that allows operator/function overloading.

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