if not isinstance(age, int) or age < 0: raise ValueError("Age must be a positive integer.") print(f"Valid age: {age}") validate_age(25) # 正确 # validate_age("25") # 将引发ValueError 此方法简单直接,但随着参数增多,代码会变得冗余
Given a list of values inputs and a positive integer n, write a function that splits inputs into groups of length n. For simplicity, assume that the length of the input list is divisible by n. For example, if inputs = [1, 2, 3, 4, 5, 6] and n = 2, your function should ...
(1)根据int举个栗子: classPositiveInteger(int): def __new__(cls, *args, **kwargs): print("param:", args) return super(PositiveInteger, cls).__new__(cls, abs(args[0])) p = PositiveInteger(-5) print(p) 执行结果: (2)再根据tuple举个栗子: __new__方法自定义要求保证实例创建、并...
1. 2. 3. 装饰器 另一种方法是使用装饰器来添加约束条件。装饰器可以在函数执行前或执行后检查输入,并根据需要引发异常。例如,我们可以编写一个装饰器来检查输入是否为正数: defcheck_positive(func):defwrapper(*args,**kwargs):ifany(arg<=0forarginargs):raiseValueError("Arguments must be positive.")ret...
defproduct(n,term):"""Return the productofthe first n termsina sequence.n--a positive integer term--afunctionthat takes one argument>>>product(3,identity)#1*2*36>>>product(5,identity)#1*2*3*4*5120>>>product(3,square)#1^2*2^2*3^236>>>product(5,square)#1^2*2^2*3^2*4^2...
foriteminitem_stream: # 如果 item 是新键,item_counts[item] 会自动变为 0,然后 +1 item_counts[item]+=1 print(f" 项目计数 (defaultdict(int)): { <!-- -->item_counts}") # 项目计数 (defaultdict(int)): defaultdict(<class 'int'>, {'apple': 3, 'orange': 2, 'banana': 1, 'gra...
# Check the list outside the function print("Outside function:", original_list) As you can see from the example, the values of the object outside the function and inside the function change. However, if the object is immutable, for example, an integer, if a change is made to the ref...
importmatplotlib.pyplotaspltimportnumpyasnp#Setting seed for reproducibilitynp.random.seed(20)#Create random datax = np.linspace(-1,1,100) signal =2+ x +2* x * x noise = np.random.normal(0,0.1,100) y = signal + noise x_train = x[0:80] ...
A positive integer greater than 1 which has no other factors except 1 and the number itself is called a prime number. 2, 3, 5, 7 etc. are prime numbers as they do not have any other factors. But 6 is not prime (it is composite) since, 2 x 3 = 6. Example 1: Using a flag ...
Python Program to Check if a Number is Positive, Negative or 0 Before we wrap up, let's put your understanding of this example to the test! Can you solve the following challenge? Challenge: Write a function to check if the entered integer is odd or even. If the given number is odd...