test2
发表在 python之美 07-19 09:20:05
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[details=答案] ```swift animal = Animal(name: "Gilbert", species: "Gorilla", tailLength: nil ) if let tailLength = animal.tailLength? { print("(animal.name)'s tail is (animal.tailLength) long") } else { print("(animal.name) doesn't have a tail.") } ``` [/details]
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[details=答案] ```swift animal = Animal(name: "Gilbert", species: "Gorilla", tailLength: nil ) if let tailLength = animal.tailLength? { print("(animal.name)'s tail is (animal.tailLength) long") } else { print("(animal.name) doesn't have a tail.") } ``` [/details]