python设计一个类，实现向量的加、减、内积等操作，需要判断输入的向量是否都是数值，并且判断向量长度是否一致

可以使用以下代码实现：

class Vector:
    def __init__(self, *args):
        self.values = args
        self.length = len(args)
        self.check_input()
        
    def check_input(self):
        for value in self.values:
            if not isinstance(value, (int, float)):
                raise TypeError('Vector values must be numeric')
        if self.length == 0:
            raise ValueError('Vector must have at least one value')
        
    def __add__(self, other):
        if self.length != other.length:
            raise ValueError('Vectors must have the same length')
        return Vector(*[self.values[i] + other.values[i] for i in range(self.length)])
    
    def __sub__(self, other):
        if self.length != other.length:
            raise ValueError('Vectors must have the same length')
        return Vector(*[self.values[i] - other.values[i] for i in range(self.length)])
    
    def dot(self, other):
        if self.length != other.length:
            raise ValueError('Vectors must have the same length')
        return sum([self.values[i] * other.values[i] for i in range(self.length)])

这个类接受任意数量的数值作为参数，并且会检查输入是否都是数值。向量的加法和减法会检查两个向量长度是否一致，如果不一致则会抛出异常。内积操作也会检查向量长度是否一致。