Question

在此hackerrank挑战中，我想编写一个Person类，该类具有一个实例变量 age ，以及一个构造函数，该构造函数将整数 initialAge 作为参数。确认传递的参数不是负数之后，构造函数必须将 initialAge 分配给 age ；如果将负参数传递为，则构造方法应设置为，并且print Age无效，将age设置为0。此外，您必须编写以下实例方法：

yearPasses（）应该将实例变量增加。
amIOld（）应该执行以下条件操作：
- 如果，则打印“您还年轻”。
- 如果和，则打印您是青少年。
- 否则，打印您已经老了。

这是代码：

class Person:
    def __init__(self,initialAge):
        # Add some more code to run some checks on initialAge
        self.initialAge = age
    def amIOld(self):
        # Do some computations in here and print out the correct statement to the console
        if age <= 0:
            age is 0
            print("Age is not valid, setting age to 0")

        elif age < 13:
            print("You are young.")

        elif 13 <= age < 18:
            print("You are teenager.")

        else:
            print("You are old.")
    def yearPasses(self):
        # Increment the age of the person in here
        return age+1
t = int(input())
for i in range(0, t):
    age = int(input())         
    p = Person(age)  
    p.amIOld()
    for j in range(0, 3):
        p.yearPasses()       
    p.amIOld()
    print("")

这是输入：

这是预期的输出：

Age is not valid, setting age to 0.
You are young.
You are young.

You are young.
You are a teenager.

You are a teenager.
You are old.

You are old.
You are old.

这是我的输出：

Age is not valid, setting age to 0
Age is not valid, setting age to 0

You are young.
You are young.

You are teenager.
You are teenager.

You are old.
You are old.

我的代码怎么了？

Answer 1

所有解决方案均以良好的方式完成，但输出不正确。以下解决方案以相同的方式完成，但正确。看一下以下解决方案：

class Person:
    def __init__(self,initialAge):
        self.age = initialAge
        if self.age <=0:
            print('Age is not valid, setting age to 0.')
        # Add some more code to run some checks on initialAge
    def amIOld(self):
        if self.age < 13:
            print('You are young.')
        elif (13<=self.age< 18):
            print('You are a teenager.')
        else:
            print('You are old.')
    # Do some computations in here and print out the correct statement to the console
    def yearPasses(self):
        self.age +=1
 # Already provided by Hackerank in the challenge!
t = int(input())
for i in range(0, t):
    age = int(input())         
    p = Person(age)  
    p.amIOld()
    for j in range(0, 3):
        p.yearPasses()       
    p.amIOld()
    print("")

Answer 2

我认为这里有很多需要改进的地方，尤其是考虑使用实例变量的情况。

class Person:

    '''The init method seems strange to me, as you seem to have mixed up the order
    of the expression. It should be the other way round.'''

    def __init__(self, initialAge):
        # order correct now
        self.age = initialAge

    def amIOld(self):
        # age was used locally here, but should reference the instance variable
        if self.age < 0:
            self.age = 0
            print("Age is not valid, setting age to 0")

        elif self.age < 13:
            print("You are young.")

        elif 13 <= self.age < 18:
            print("You are teenager.")

        else:
            print("You are old.")

    def yearPasses(self):
        # no need to return anything here, as you just alter the instance var
        self.age += 1

# hint: you can just use range(t) as the default start val is 0
t = int(input())
for i in range(t):

    age = int(input())
    p = Person(age)  
    p.amIOld()
    for j in range(3):
        p.yearPasses() 
    p.amIOld()
    print("")

我的机器上的输出是：

Age is not valid, setting age to 0
You are young.

You are young.
You are teenager.

You are teenager.
You are old.

You are old.
You are old.

我是旧的Hackerrank挑战吗

2 个答案: