Question

我已经制作了一个类向量，但是当我想要划分Vector / 0时它没有正确划分，它不会抛出错误：

class Vector(tuple):

    '''"Class to calculate the usual operations with vectors in bi and
    tridimensional coordinates. Too with n-dimmensinal.'''
    # __slots__=('V') #It's not possible because V is a variable list of param.
    def __new__(cls, *V):
        '''The new method, we initialize the coordinates of a vector.
        You can initialize a vector for example: V = Vector() or
        V = Vector(a,b) or V = Vector(v1, v2, ..., vn)'''
        if not V:
            V = (0, 0)
        elif len(V) == 1:
            raise ValueError('A vector must have at least 2 coordinates.')
        return tuple.__new__(cls, V)

   def __mul__(self, V):
    '''The operator mult overloaded. You can multipy 2 vectors coordinate
     by coordinate.'''
    if type(V) == type(self):
        if len(self) != len(V):
            raise IndexError('Vectors must have same dimmensions')
        else:
            multiplied = tuple(a * b for a, b in zip(self, V))
    elif isinstance(V, type(1)) or isinstance(V, type(1.0)):
        multiplied = tuple(a * V for a in self)
    return Vector(*multiplied)

__rmul__ = __mul__

   def make_one(self, long):
        one = tuple(1 for a in range(0, long))
        return Vector(*one)

    def __truediv__(self, V):
        if type(V) == type(self):
            if len(self) != len(V):
                raise IndexError('Vectors must have same dimmensions.')
            if 0 in V:
                raise ZeroDivisionError('Division by 0.')
            divided = tuple(a / b for a, b in zip(self, V))
            return Vector(*divided)
        elif isinstance(V, int) or isinstance(V, float):
            if V == 0:
                return self * V * Vector().make_one(len(self))
                #raise ZeroDivisionError('Division by 0.')
            return self * (1 / V) * Vector().make_one(len(self))

    __rtruediv__ = __truediv__

测试代码：

from Vector import Vector

def main():
    V1 = Vector(3, 2, -1, 5)

    print(0 / V1)
    print(V1 / 0)

if __name__ == '__main__':
    main()

控制台输出

（0,0,0,0）（0,0,0,0）

第一个输出是正确的，但第二个输出是错误的，正确的方法是ErrorDivision 0。

Answer 1

好的，感谢@ user2357112，正确的代码是：

def __truediv__(self, V):
    if type(V) == type(self):
        if len(self) != len(V):
            raise IndexError('Vectors must have same dimmensions.')
        if 0 in V:
            raise ZeroDivisionError('Division by 0.')
        divided = tuple(a / b for a, b in zip(self, V))
        return Vector(*divided)
    elif isinstance(V, int) or isinstance(V, float):
        if V == 0:
            raise ZeroDivisionError('Division by 0.')
        return self * (1 / V) * Vector().make_one(len(self))

#__rtruediv__ = __truediv__
def __rtruediv__(self, V):
    if isinstance(V, int) or isinstance(V, float):
        if V == 0:
            return self * V * Vector().make_one(len(self))
        return self * (1 / V) * Vector().make_one(len(self))

错误划分向量Python

1 个答案: