JuniorTheoryCommon

What does the program print?

Python

class Point:
    def __init__(self, x):
        self.x = x

    def __repr__(self):
        return f"Point({self.x})"

    def __str__(self):
        return f"point {self.x}"


print(Point(1), [Point(2)])

point 1 [Point(2)]

Expecting [point 2], as if print used __str__ for everything: a list shows its items with __repr__, so the Point inside it prints as Point(2).
Expecting Point(1) because __repr__ comes first in the class: the order of methods does not matter, print calls __str__ on an object it gets directly.

What would print(Point(1)) show if the class had only __repr__?
What does print(f"{Point(3)!r}") print, and why?

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JuniorTheoryCommon

What does the program print?

Python

class Point:
    def __init__(self, x):
        self.x = x

    def __repr__(self):
        return f"Point({self.x})"

    def __str__(self):
        return f"point {self.x}"


print(Point(1), [Point(2)])

point 1 [Point(2)]

Expecting [point 2], as if print used __str__ for everything: a list shows its items with __repr__, so the Point inside it prints as Point(2).
Expecting Point(1) because __repr__ comes first in the class: the order of methods does not matter, print calls __str__ on an object it gets directly.

What would print(Point(1)) show if the class had only __repr__?
What does print(f"{Point(3)!r}") print, and why?

Back to questions Open topic in roadmap →Answer it yourself — Quiz