PCAP Object-Oriented Programming Practice Question
Which TWO of the following are special methods in Python?
⚠ Common exam trap
Python Institute often tests the distinction between actual special methods (like `__init__` and `__str__`) and arbitrary dunder-named attributes that are not part of Python's language specification, leading candidates to mistakenly think any name with double underscores is a special method.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
`__init__`
In Python, special methods (also called dunder or magic methods) are predefined methods with names of the form __name__ that the interpreter invokes implicitly to implement language features. Option C, `__init__`, is the initializer special method that Python calls automatically when an instance is created, e.g., `obj = MyClass()`, to set up the object's initial state. Option D, `__str__`, is the special method that Python calls by default by `str(obj)` and `print(obj)` to produce a human-readable string representation of the object. By contrast, options A (`__bar__`) and E (`__foo__`) merely follow the double-underscore naming pattern but are not defined by the Python data model as special methods, so they are ordinary attributes. Option B, `__main__`, is not a method at all; it is the name of the top-level execution scope (the value of `__name__` for the main script) and the conventional module name checked with `if __name__ == "__main__":`.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
`__bar__`
Why it's wrong here
A dunder name alone does not make a special method; Python reserves specific identifiers such as __init__ or __str__, and __bar__ is merely a user-defined name with no interpreter hook. It tempts because the double-underscore convention visually mimics genuine special methods, which are the correct answer when the exact reserved name is listed.
- ✗
`__main__`
Why it's wrong here
__main__ is a module-level string attribute holding the top-level script's name, not a method defined on a class. It tempts because it appears in the familiar if __name__ == '__main__' idiom, which is the correct context for it, but it never participates in operator overloading or object protocol dispatch.
- ✓
`__init__`
Why this is correct
`__init__` is a special (dunder) method automatically invoked by Python when an instance is created, initialising the object's attributes. It satisfies the stem's requirement for special methods, which are defined by reserved double-underscore names and called implicitly by the interpreter rather than by explicit invocation.
- ✓
`__str__`
Why this is correct
__str__ is a special method, called by str() and print() to produce a readable string representation. Its double-underscore naming identifies it as part of Python's data model, satisfying the question's requirement for a genuine special method.
- ✗
`__foo__`
Why it's wrong here
__foo__ matches the dunder naming pattern but is not a reserved Python special method; the interpreter only invokes names it explicitly defines, such as __len__ or __eq__. It tempts because any double-underscore wrapper looks like a magic method, and such names are the correct answer only when they appear in Python's documented data model.
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